Cozying into your sleeping bag at the end of a long day on the trail is one of the great pleasures of backpacking. And today’s bags offer exceptional warmth for the weight along with a range of technologies that help them stay dry and perform in a variety of conditions. The majority of the bags on this list are filled with down, which is warmer, lighter, and more compressible than synthetic insulation (although we did include a couple of top synthetic models as well). For more background, see our sleeping bag comparison table and buying advice below the picks. To complete your kit, see our articles on the best backpacking tents and sleeping pads.

Best Overall Sleeping Bag

1. REI Co-op Magma 15 ($369)

REI Co-op Magma 15 sleeping bagTemperature rating: 28°F ISO Comfort, 16°F Lower Limit
Weight: 1 lb. 12.2 oz.
Fill: 850-fill goose down
What we like: A premium sleeping bag at a good price.
What we don’t: Variable baffle spacing left us feeling a bit chillier than expected. 

Years ago, we passed on most REI hard goods because the quality wasn’t competitive. In 2019, that simply is no longer the case. REI’s in-house offerings have been very impressive of late, with a strong lineup of quality backpacking gear at reasonable price points. The latest Magma 15 is case in point: for $369, you get a super cozy sleeping bag that weighs just 1 pound 12.2 ounces and is loaded with 15.9 ounces of 850-fill down (REI now also makes a 30-degree version at 1 pound 3.8 ounces and $319). In terms of specs, the Magma is right in line with heavy hitters from brands like Feathered Friends and Western Mountaineering but with considerably less damage to your wallet.

In practice, the REI Magma isn’t perfect. Despite the impressive temperature rating, we’ve found that past versions of this bag didn’t run quite as warm as suggested. It’s difficult to pinpoint exactly why, but the variable baffle spacing could have something to do with it (the baffles on the lower half of the body are noticeably wider than the upper half, which may have left our legs and feet feeling a tad chilly). That issue aside, the Magma is a premium backpacking bag at a reasonable price and low weight, which is why it’s ranked here. As we touched on above, REI expanded the Magma line for 2019 by offering 15-degree and 30-degree versions for men and women, plus a 30-degree Magma Quilt. 
See the REI Co-op Magma 15  See the Women's REI Co-op Magma 15


A Close Second

2. Feathered Friends Swallow 20 YF ($449)

Feathered Friends Swallow 20 YF sleeping bagTemperature rating: 20°F
Weight: 1 lb. 12.7 oz.
Fill: 900-fill goose down
What we like: Premium down and build quality for less than Western Mountaineering.
What we don’t: Availability can be limited during peak backpacking season.

If you haven’t heard of Seattle-based Feathered Friends, do yourself a favor and get introduced. This small company specializes in premium down products and makes just about everything in the U.S.A. Climbers stop in religiously before heading to Mt. Rainier, Alaska, and far-off places like the Himalaya, and it’s well worth a visit if you’re in Seattle (their new store is right across from the REI flagship). Most importantly, their sleeping bags and other down products are exceptionally well-built and competitively priced for what you get.

The Swallow 20 is Feathered Friends' most popular 3-season backpacking bag and for good reason. The specs are impressive: the bag weighs well under 2 pounds, is loaded with 16.8 ounces of 900-fill goose down, and has a very legitimate 20-degree temperature rating (Feathered Friends is conservative with its ratings, if anything). In fact, we like the Swallow 20 over the popular Western Mountaineering UltraLite below: the Feathered Friends uses slightly better down (900-fill vs. 850-fill) and more of it (16.8 ounces vs. 16 ounces) while costing a significant $76 less for the regular length. For those looking to cut even more weight, Feathered Friends make an ultralight version of this bag, the Swallow UL 20, that tips the scales at just 1 pound 11 ounces, has a thinner 15D shell, and costs $529. 
See the Feathered Friends Swallow YF  See the Women's Feathered Friends Egret YF


Best Budget/Synthetic Sleeping Bag

3. Marmot Trestles 30 ($99)

Marmot Trestles sleeping bagTemperature rating: 36.1°F EN Comfort, 26.2°F Lower Limit
Weight: 3 lbs. 1 oz.
Fill: Synthetic (SpiraFil LT polyester)
What we like: Cheap, cozy, and resists moisture well. 
What we don’t: Synthetic insulation is less compressible than down. 

For new backpackers or those on a budget, you don’t need to spend hundreds of dollars on a sleeping bag. The Marmot Trestles 30 checks many of the boxes that casual backpackers look for: it’s decently warm with a 36-degree EN Comfort rating, weighs just over 3 pounds, and features a cozy feel and quality build that should last. Most importantly, it has a bargain-basement price of $99 for the regular size, which is a whole lot of bang for your buck. 

The biggest downside of the Marmot Trestles—and the reason it’s so inexpensive—is the synthetic fill. Down wins out in warmth-to-weight ratio and packability, and Marmot’s SpiraFil LT polyester is bulky in comparison (an upside is that synthetics insulate much better than down when wet). This means that the Trestles isn’t ideal for extended trips when space or weight are at a premium, but it’s a fine option for shorter outings and as a crossover car-camping bag. And Marmot does make a variety of models in this popular line, including lighter-weight Elite Eco versions with 100-percent-recycled materials and varying warmth ratings all the way down to “0”. For our leading budget options with down fill, see The North Face Furnace and Kelty Cosmic below.
See the Marmot Trestles 30  See the Women's Marmot Trestles 30


Best Sleeping Bag for Side Sleepers

4. Nemo Disco 30 ($260)

Nemo Disco 30 sleeping bagTemperature rating: 30°F
Weight: 2 lbs. 5 oz.
Fill: 650-fill down
What we like: A super roomy and comfortable bag for side sleepers and those who toss and turn.
What we don’t: Heavier than slimmer-cut bags with similar temperature ratings (more fabric and down equals more weight).

Building on their successful "spoon” shaped Nocturne, Nemo has expanded their lineup of roomy sleeping bags. The focus here is on comfort: Nemo bags are wider than a typical mummy, particularly in the elbows and knees so side sleepers and others can roll around without restrictions. The Disco and women’s Rave are their mid-range offerings with 650-fill water-resistant down, a waterproof panel around the toe box for added protection, and a built-in sleeve for a pillow. An additional feature is two zippered “gills” running lengthwise at the top of the bag. Unzipping them creates intentional cold spots to release hot air in warm conditions. We found the system—along with a blanket fold that can be pushed out around the collar—very helpful on a mild night in Utah.

The main compromise in the Disco’s accommodating design is weight. For a 30-degree bag, it’s on the heavy side at 2 pounds 5 ounces (the 15-degree model comes in at 2 pounds 12 ounces). Another issue is that the Nemo’s interior fabric is soft but not quite as luxurious as we would prefer at this price point. But if the roomy fit, impressive feature set, and adjustable gills appeal to you, the Disco is a great option.
See the Nemo Disco 30  See the Women's Nemo Rave 30


Best Ultralight Sleeping Quilt

5. Katabatic Gear Flex 22 ($370)

Katapatic Gear Flex 22 sleeping quiltTemperature rating: 22°F
Weight: 1 lb. 6.5 oz.
Fill: 900-fill goose down
What we like: A proven ultralight quilt design with a premium build.
What we don’t: Less comfortable than a mummy bag and requires more effort to set up.

All of the bags above are of the mummy variety, but many ultralighters and thru-hikers favor a different design altogether: a sleeping quilt. In terms of design differences, the large mummy hood is gone and the back opens up with a series of ties. You can sleep in a quilt like a traditional sleeping bag, but most people open it up and connect it to their sleeping pad (make sure to get a pad with a proper R-value for insulation from the ground, and most people wear their hooded down jacket when sleeping for head coverage). The end result is less comfort because you’re sleeping directly on the pad, a notable weight savings, and a minimalist design that ounce counters love.

Our favorite sleeping quilt for backpacking is the Flex 22 from Colorado-based cottage brand Katabatic Gear. With the Flex you get a cozy 22-degree temperature rating, a quality build with soft-touch fabrics, and considerable weight savings over our top mummy bag picks. Keep in mind that this quilt is a slender 54 inches in the shoulders, which is pretty snug when used like a regular sleeping bag. And connecting the Flex 22 to the pad takes more time than just laying out a standard sleeping bag, which is something that you may not appreciate after a long day on the trail. Of note: Western Mountaineering has released its first-ever sleeping quilts for 2019 including the Astralite 26, as has REI with the Magma 30. And for a cheaper quilt option, see the Enlightened Equipment Revelation 20 below. 
See the Katabatic Gear Flex 22


Best of the Rest

6. Western Mountaineering UltraLite ($525)

Western Mountaineering UltraLite sleeping bagTemperature rating: 20°F
Weight: 1 lb. 13 oz.
Fill: 850-fill goose down
What we like: Lightweight, super comfortable, and well built. 
What we don’t: Pricier and has a thinner shell than the top two bags. 

Similar to Feathered Friends, Western Mountaineering is a down specialist and longtime favorite among serious backpackers and climbers. Their bags are supremely comfortable, lightweight, and made in the U.S.A. Aside from the high prices—premium down does cost a lot no matter where you get it—we have nothing but positive things to say about the brand. We’ve used their sleeping bags in unforgiving conditions from Nepal to Arctic Norway and they’ve worked great.

The UltraLite is Western Mountaineering’s most popular 3-season backpacking bag and has been around for years with few changes. Compared to the Swallow YF above, the shell is thinner at 12D and comes with a slightly lower-quality down, but the bag also weighs 0.3 ounces more. That said, we think Western Mountaineering’s shell fabrics are a little softer than Feathered Friends, which makes the UltraLite arguably the most comfortable 20-degree bag on the market. For more room, the Alpinlite is a wider version of this bag, giving you an extra 5 inches of girth in the shoulders and 4 inches in hips while only adding 2 ounces of total weight.
See the Western Mountaineering UltraLite


7. The North Face Furnace 20 ($179)

The North Face Furnace 20 sleeping bagTemperature rating: 26°F EN Comfort, 14°F Lower Limit
Weight: 2 lbs. 12 oz.
Fill: 600-fill goose down, synthetic (Heatseeker)
What we like: Our favorite bag under $200. 
What we don’t: Bulkier and heavier than the options above.

In terms of value, you won't find a better backpacking bag than the Furnace 20 from The North Face. For less than $200, you get a cozy 26°F EN Comfort rating, which should be ample for most 3-season adventures. At 2 pounds 12 ounces, the Furnace isn't ultralight but gets the job done for weekenders and short trips into the backcountry. Finally, it's decently wide through the shoulders and hips for those who like a roomier fit. All in all, that's a whole lot of sleeping bag for a reasonable price.

What are the downsides of The North Face Furnace 20? The insulation is a mix of 600-fill down and Heatseeker synthetic, the combination of which isn't as warm or packable as the premium options above (you do get goose down, which is superior to the duck down used in many cheaper bags). However, this is what helps keep the price low, which along with warmth, is why so many people love this bag. For more budget options, see the fully synthetic Marmot Trestles above and lighter Kelty Cosmic below. 
See The North Face Furnace 20  See the Women's North Face Furnace 20


8. Marmot Hydrogen ($329)

Marmot Hydrogen sleeping bagTemperature rating: 33.6°F EN Comfort, 24.4°F Lower Limit
Weight: 1 lb. 7.3 oz.
Fill: 800-fill goose down
What we like: Light and comfortable.
What we don’t: Lower fill power and fill weight than our top picks.

Many of the bags on this list have temperature ratings in the 20-degree range—that’s the sweet spot for a 3-season all-rounder. But for summer backpacking where the temperature won’t really drop, the Marmot Hydrogen is a great way to save weight and money. This lightweight bag should keep you comfortable down to around freezing and a little colder in a pinch, which can work great for warm-weather backpacking trips into the mountains, and should be plenty for those staying at lower elevations. And less down fill means the total weight of the bag dips below 1.5 pounds.

Along with the Hydrogen, Marmot also offers the warmer Helium (13.5°F EN Lower Limit) and winter-weight Lithium (-4.5°F EN Lower Limit). All use 800-fill goose down instead of the 850- or 900-fill of Western Mountaineering or Feathered Friends, respectively, but Marmot has a good formula going with these backpacking bags. If you like other Marmot products, we bet you’ll enjoy the Hydrogen too.
See the Marmot Hydrogen


9. Nemo Forte 20 ($190)

Nemo Forte 20 sleeping bagTemperature rating: 29°F EN Comfort, 18°F Lower Limit
Weight: 3 lbs. 1 oz.
Fill: Synthetic (Stratofiber)
What we like: A roomy and warm synthetic bag. 
What we don’t: Bulky, although we do like the included compression sack.

For backpacking, we almost always favor down sleeping bags over synthetics—they pack down smaller and provide more warmth for the weight. That said, you can’t beat the price of a synthetic bag, or in this case, the comfort. The Nemo Forte takes the generous shape and roominess of the popular Disco above, adds a very respectable 29-degree EN Comfort rating, and cuts a significant $70 off the price. For a cozy synthetic bag for side sleepers and those who like a little extra room, the Forte is a great choice.

Despite all of the positives, it’s still an uphill battle in comparing the Nemo Forte to a leading budget down bag like The North Face Furnace above. The latter is 5 ounces lighter, $11 cheaper, and slightly warmer with a 26-degree EN Comfort rating. But again, the big selling point here is comfort: the Furnace is heavily tapered like a traditional mummy bag, whereas the Forte offers noticeably more space around the elbows and knees. We also like the gills, which allow you to dump heat without unzipping the entire bag, and the included compression sack. All in all, the Forte isn’t perfect, but it’s another creative option from Nemo at a good price.
See the Nemo Forte 20  See the Women's Nemo Viola 20


10. Therm-a-Rest Hyperion 20 ($410)

Therm-a-Rest Hyperion 20 sleeping bagTemperature rating: 32°F EN Comfort, 20°F Lower Limit
Weight: 1 lb. 4 oz.
Fill: 900-fill goose down
What we like: An ultralight mummy bag with an incredibly small packed size. 
What we don’t: Narrow cut with little insulation on the bottom. 

Well, look what we have here: Therm-a-Rest—part of the larger family of brands that includes MSR—is making big waves in 2019 with the new and ultralight Hyperion. The specs on this sleeping bag are fairly staggering: a 20-degree lower limit rating, 900-fill goose down, and a total weight of just 1 pound 4 ounces (that’s not a misprint). That’s lighter than two of the cottage-brand sleeping quilts on this list including the Katabatic Gear Flex 22 and Enlightened Equipment Revelation, which have an open back and no mummy hood. Did we mention the incredibly small packed size? See the photo in our buying advice below for proof. 

How was Therm-a-Rest able to achieve this all with the Hyperion? The answer is a very aggressive design that is heavily tapered (read: not super roomy) along with putting 70% of the down fill on top of your body and much less on the bottom. This means that you should bring along a sleeping pad with a decent R-value to insulate you from the ground, and if you happen to turn over on your side and bring the bag with you, you’ll likely get cold. However, we can’t help but love the ingenuity. For back sleepers looking for a premium ultralight bag, the Hyperion is a great option. 
See the Therm-a-Rest Hyperion 20


11. Kelty Cosmic 20 ($170)

Kelty Cosmic 20 sleeping bagTemperature rating: 19°F Lower Limit
Weight: 2 lbs. 6.6 oz.
Fill: 600-fill down
What we like: Inexpensive for a down bag.
What we don’t: The materials and build quality are a noticeable step down from pricier options.

For new backpackers and those on a budget, Kelty makes inexpensive gear that may pleasantly surprise you with its quality. The Cosmic 20 is one of the cheaper down sleeping bags on the market—definitely from one of the major manufacturers—but the EN Lower Limit rating of 19 degrees should keep you reasonably warm in most 3-season conditions. It’s true that the 600-fill power down doesn’t offer the same warmth or packability as most other bags on this list, but we love the value and you get the bonus of a hydrophobic treatment for wet conditions.

Interestingly, Kelty updated the Cosmic line for 2019, with the major change being a thinner 20-denier shell fabric (the old version had a much burlier 50-denier shell). The net result is a substantial drop in weight (the old version weighed over 6 ounces more at 2 pounds 13 ounces), which all backpackers should appreciate. The truth is that unless you have a dog that will be trampling your bag or expect other rough treatment, it should be on the inside of your tent and not subject to much abuse. And now at less than 2 and a half pounds all-in, the Kelty Cosmic is a very viable backpacking bag on a budget.  
See the Kelty Cosmic 20  See the Women's Kelty Cosmic 20


12. Feathered Friends Tanager 20 CFL ($369)

Feathered Friends Tanager 20 hoodless sleeping bagTemperature rating: 20°F
Weight: 1 lb. 2.6 oz.
Fill: 950-fill down
What we like: Hoodless bag design is ultralight but surprisingly warm.
What we don’t: No zipper and very thin fabrics.

We've covered both mummy bags (the most common type) and sleeping quilts (an ultralight favorite) above, but there's a third option that may offer the best of both worlds: hoodless sleeping bags. Most experienced backpackers bring a lightweight down jacket into the backcountry—you need it for chilly mornings and evenings around camp, and many people wear it to sleep. New for 2019, our favorite hoodless sleeping bag is the Feathered Friends Tanager. It's warm with a 20-degree temperature rating (the same as the Swallow Nano above), super light at just 18.6 ounces (10 ounces lighter than the Swallow Nano), and less expensive to boot. Of course, Feathered Friends recommends that you pair the Tanager with their lightweight Eos, but any quality down jacket with a hood will do. 

In terms of features, the Tanager has a drawcord closure around the collar for sealing in warmth, but no zipper. This cuts down on weight but does make the bag more difficult to vent on warm nights. In addition, the 7-denier Pertex Quantum shell fabric is ultrathin by any standards (you can see the down through the bag), but if there is any piece of gear that doesn't require durability, it's your sleeping bag (it's either in a stuff stack or inside your tent). It's worth noting that the Tanager actually has slightly wider dimensions around the chest than ultralight mummy bags like the Swallow Nano and Western Mountaineering UltraLite, making it a surprisingly comfy option. For another interesting hoodless bag for warmer weather, the Therm-a-Rest Ohm has a 32-degree temperature rating and a roomier fit at roughly the same weight (18 ounces).
See the Feathered Friends Tanager 20 CFL


13. Big Agnes Anvil Horn 15 ($270)

Big Agnes Anvil Horn 15 sleeping bagTemperature rating: 15°F
Weight: 2 lbs. 5 oz.
Fill: 650-fill down
What we like: Roomy and reasonably priced.
What we don’t: Not everyone likes the pad sleeve.

Big Agnes is perhaps best known for their backpacking tents, but they also offer a compelling line of sleeping bags. For 2019, we like the new Anvil Horn 15 best: it’s roomy inside but still an efficient insulator, and competitively priced at $270. The 15-degree temperature rating does feel somewhat optimistic (Big Agnes does not use the EN rating system and isn’t as conservative as Feathered Friends or Western Mountaineering), but combining the Anvil Horn with a well-insulated sleeping pad should keep you comfortable on most 3-season backpacking trips. 

The Anvil Horn’s most polarizing feature (like many bags from Big Agnes) is its lack of insulation on the bottom and attached sleeping pad sleeve. Some people love the integrated system that keeps you from sliding around and cuts out unnecessary down. Further, the Anvil Horn has their latest flexible sleeve that can accommodate both 20- and 25-inch wide pads. However, active and side sleepers that like to rotate within their bag may find it restrictive, and there’s probably good reason why few other manufacturers have adopted this design. Pad sleeve notwithstanding, the Big Agnes is a relatively roomy, inexpensive, and versatile sleeping bag that can be used for backpacking or camping.
See the Big Agnes Anvil Horn 15  See the Women's Big Agnes Daisy Mae 15


14. Marmot Sawtooth ($239)

Marmot Sawtooth sleeping bag (2018)Temperature rating: 27.1°F EN Comfort, 15.6°F Lower Limit
Weight: 2 lbs. 8 oz.
Fill: 650-fill duck down
What we like: Lots of warmth for the price.
What we don’t: Relatively heavy.

Most sleeping bags in this price range have an EN Comfort rating around freezing or just above. For those that run cold or want a little extra warmth for the shoulder seasons, try the Marmot Sawtooth. This bag is warm, comfortable, and the 20.8 ounces of 650-fill down offer a nice compromise of performance and value. Further, with the added Down Defender treatment for water resistance, the Sawtooth amounts to a great all-around sleeping bag at under $250.

Keep in mind that the 27-degree EN Comfort rating is ample for most backpacking jaunts into the mountains and won’t have you checking the forecast incessantly before the trip, but the Sawtooth may be overkill for warm summer conditions. And it’s not warm enough for true winter camping, so again, it’s best for those who run cold or get out in spring and fall. For higher-fill-power options from Marmot, see the Plasma series. 
See the Marmot Sawtooth  See the Women's Marmot Angel Fire


15. Enlightened Equipment Revelation 20 ($300)

Enlightened Equipment Revelation 20 quiltTemperature rating: 20°F
Weight: 1 lb. 4.3 oz.
Fill: 850-fill down
What we like: Inexpensive and tons of customizations.
What we don’t: Lengthy shipping time.

We explained the quilt-style design in our write-up of the Katabatic Gear Flex 22 above, and the Revelation 20 quilt from Minnesota-based Enlightened Equipment is an even more affordable option. To start, we absolutely love Enlightened Equipment’s website and the incredible number of customization options. You can get the Revelation in two different fill powers, six temperature ratings, five lengths, four widths, and 19 fabric options. You can even add optional 20D weather-resistant strips. Shipping does take 3-5 weeks as these bags are custom-made, but it’s a pretty darn cool system.

The consensus on the Revelation 20 is that it's an outstanding value for a quilt but slightly inferior in build quality to the Katabatic Flex 22 above. Given the significant difference in price, it’s really up to whether you want to save or spend up for the premium build. The shipping time can be a downside too, making it out of reach for those who don’t plan far ahead (Katabatic Gear has a shorter turnaround at about 1 week). Either way, we can’t help but love a small U.S.-based company like Enlightened Equipment that takes the time to do it right.
See the Enlightened Equipment Revelation 20


16. Patagonia 850 Down Sleeping Bag ($499)

Patagonia%20850%20Down%20Sleeping%20Bag_1.jpgTemperature rating: 30°F EN Comfort, 19°F Lower Limit
Weight: 2 lb. 2 oz.
Fill: 850-fill goose down
What we like: Warm, comfortable, and nice colorways.
What we don’t: Center zipper wasn’t a game changer for us.

Released in 2017, we’ve never seen a sleeping bag launch get this much press. But Patagonia pretty much is synonymous with outdoor gear and the 850 Down Sleeping Bag doesn’t hold back. At $500, it’s priced right up there with high-end options from Feathered Friends and Western Mountaineering. The specs are impressive: 850-fill goose down, a whopping 19.7 ounces of it, and a 15D shell. We have the 19-degree version listed here, but Patagonia also released a 30-degree version that weighs 25.9 ounces total.

Why is the Patagonia 850 Down Sleeping Bag ranked towards the bottom of our list? We still like the Feathered Friends Swallow 20 best at a lower $449, and the similarly priced Western Mountaineering UltraLite comes from a long lineage that has stood the test of time (there were a couple of quirks with the first run of this bag). And in terms of features, the center zipper on the Patagonia 850 wasn’t a game changer in our opinion. It’s still a really nice high-end bag, and we look forward to continuing to test it in the alpine this spring and summer... Read in-depth review
See the Patagonia 850 Down Sleeping Bag


17. REI Co-op Radiant 19 ($199)

REI Co-op Radiant sleeping bagTemperature rating: 32°F EN Comfort, 19°F Lower Limit
Weight: 2 lbs. 8 oz.
Fill: 600-fill duck down
What we like: A comfortable down bag at a good price.
What we don’t: Roomy fit makes this bag drafty. 

At a respectable 2 pounds 8 ounces, the REI Co-Op Radiant is more wallet-friendly than the high-end Magma above yet still gets the job done. For just under $200, you get a comfortable sleeping bag with 600-fill water-repellent down, and a DWR treatment on the shell for added protection against moisture. For weekend backpackers or those first taking the plunge on gear, the Radiant is a reasonably priced way to get the job done.

Our biggest concern with the REI Radiant is its roomy fit and resulting impact on warmth. The bag advertises being relaxed in the shoulders and hips, which unfortunately is overly roomy for most people and can end up being drafty. Despite the 19-degree temperature rating, many people find that it simply runs colder than that. Further, the 600-fill duck down isn’t as lofty or packable as the 850-fill goose down in the Magma and others. But if you’re not stretching the seasons or going high into the mountains, the Radiant can be a solid bag down to about freezing. 
See the REI Co-op Radiant 19  See the Women's REI Co-op Serrana 20


18. Feathered Friends Snowbunting EX 0 ($619)

Feathered Friends Snowbunting sleeping bagTemperature rating: 0°F
Weight: 2 lbs. 13 oz.
Fill: 900-fill goose down
What we like: An incredibly warm and weather resistant bag.
What we don’t: Overkill for most non-winter applications.

Cold-weather camping can be intimidating prospect, but one night in the Snowbunting might have you feeling a lot more comfortable. Packed with a whopping 25.3 ounces of ultra-premium 900-fill down, the 0-degree Snowbunting (likely a conservative estimate, knowing Feathered Friends) is perfect for expeditions, ski touring, and any other form of winter camping. Moreover, the Pertex Shield is a fabric used in many rain jackets, making for an impressively weather resistant shell. And with a relatively narrow fit and no-frills design, the Snowbunting weighs only 2 pounds 13 ounces, which is as light as many 3-season bags.

At $619, the Feathered Friends Snowbunting is a big investment, so you’ll want to be sure you truly need such a high degree of warmth. Even if you’re a cold sleeper, a quality bag like the Swallow YF above should be sufficient for most three-season backpacking. But as far as winter bags go, this is our top pick. Feathered Friends is one of the only companies using 900-fill down and their track record for high quality construction is second to none. If you need a roomier fit and aren’t as concerned about weatherproofing, Western Mountaineering’s Antelope MF is another contender.
See the Feathered Friends Snowbunting EX 0 


19. Teton Sports LEEF +20°F ($75)

Teton Sports LEEF +20°F sleeping bagTemperature rating: 20°F
Weight: 3 lbs. 8 oz.
Fill: Synthetic (PolarLite)
What we like: Bargain basement price and decent warmth.
What we don’t: Heavy and bulky for backpacking.

The sub-$100 price range typically is where you’ll find car camping bags, but Teton Sports’ LEEF is a solid value option for casual backpackers. Despite being available for $75 on sites like Amazon, the LEEF has a host of features you usually find on premium sleeping bags: a full-length baffle along the zipper to prevent cold spots, insulation mapping that places more synthetic fill around areas prone to being cold, and an adjustable hood that cinches evenly around the face. The LEEF is only available in a single size—most bags above are offered in regular and long—but its 87-inch length makes it a fine choice for tall backpackers.

The 20°F temperature rating puts the Teton Sports LEEF in-line with our top picks, but at 3 pound 8 ounces, it’s by far the heaviest bag on our list. The culprit is the cheap synthetic “PolarLite” fill, which weighs more and is less compressible than down or a more advanced synthetic like you get with the Marmot Trestles above. As a result, backpackers who get out a lot or are looking to trim weight will want to steer clear of the LEEF, but for quick weekend trips with friends and family, it’s a nice way to get out without breaking the bank.
See the Teton Sports LEEF +20°F


Backpacking Sleeping Bag Comparison Table

Sleeping Bag Price Temp* Weight Fill Fill Weight Shell
REI Co-op Magma 15 $369 28°F (ISO) 1 lb. 12.2 oz. 850-fill down 15.9 oz. 15D
Feathered Friends Swallow 20 YF $449 20°F 1 lb. 12.7 oz. 900-fill down 16.8 oz. 20D
Marmot Trestles 30 $99 36°F (EN) 3 lbs. 1 oz. Synthetic 30 oz. 70D
Nemo Disco 30 $260 30°F 2 lbs. 5 oz. 650-fill down 15 oz. 30D
Katabatic Gear Flex 22 $370 22°F 1 lb. 6.5 oz. 900-fill down 13.5 oz. 15D
Western Mountaineering UltraLite $525 20°F 1 lb. 13 oz. 850-fill down 16 oz. 12D
The North Face Furnace 20 $179 26°F (EN) 2 lbs. 12 oz. 600-fill down 14 oz. 50D
Marmot Hydrogen $329 34°F (EN) 1 lb. 7.3 oz. 800-fill down 10.9 oz. 20D
Nemo Forte 20 $190 29°F (EN) 3 lbs. 1 oz. Synthetic 30 oz. 40D
Therm-a-Rest Hyperion 20 $410 32°F (EN) 1 lb. 4 oz. 900-fill down 13 oz. 10D
Kelty Cosmic 20 $170 ~30°F 2 lbs. 6.6 oz. 600-fill down 18.2 oz. 20D
Feathered Friends Tanager 20 CFL $369 20°F 1 lb. 2.6 oz. 900-fill down 12.6 oz. 7D
Big Agnes Anvil Horn 15 $270 15°F 2 lbs. 5 oz. 650-fill down 17 oz. 15D
Marmot Sawtooth $239 27°F (EN) 2 lbs. 7.5 oz. 650-fill down 20.8 oz. 30D
Enlightened Equipment Revelation $300 20°F 1 lb. 4.3 oz. 850-fill down 13 oz. 10D
Patagonia 850 Down Sleeping Bag $499 30°F (EN) 2 lbs. 0.2 oz. 850-fill down 19.7 oz. 15D
REI Co-op Radiant 19 $199 32°F (EN) 2 lbs. 8 oz. 600-fill down 16.6 oz. 30D
Feathered Friends Snowbunting $619 0°F 2 lbs. 13 oz. 900-fill down 25.3 oz. 15D
Teton Sports LEEF +20°F $75 20°F 3 lbs. 8 oz. Synthetic Unavailable 40D

*Editor's Note: For the purposes of this table, we have included the EN or ISO Comfort rating, which we feel is the most accurate point of comparison. When available, we've listed both the Comfort and Lower Limit in the product specs above. For more on the differences, see our buying advice below.

Backpacking Sleeping Bag Buying Advice

Seasons and Temperature Ratings

Summer and Two-Season Bags (32°F and Above)
We are careful when recommending warm weather bags because they leave the least room for error. If it’s summer and you’re camping in a hot place like Utah or at low elevation in a place like Colorado, a 32-plus degree bag should do the trick. The advantage is that you can keep your pack lighter as these bags weigh as little as one pound and compress down incredibly small. However, one cold night can make for an uncomfortable trip. When carrying a true summer bag, bring a beanie and other layers that can help you keep warm if there happens to be an unexpected drop in temperature. To avoid any mishaps, we usually prefer to use three-season bags unless we are going ultralight, and a borderline option like the superlight Marmot Hydrogen (34°F EN Comfort) is a good compromise. You can open them up at night when necessary or sleep on top on balmy nights. 

Summer backpacking bag
You can get away with less insulation on warm summer nights

Three-Season Bags (32°F to 20°F)
The majority of backpacking sleeping bags are of the three-season variety. We love their versatility: in the summer you can unzip and stay reasonably cool, but they also allow for spring, fall, and alpine backpacking where the temperature drops to freezing or below (this often happens in the night in the mountains even during the summer). In this category we love the The North Face Furnace 20, which hits that temperature sweet spot for a wide range of trips and comes in at a very reasonable price point. If price isn’t an issue, Feathered Friends and Western Mountaineering make some of the finest backpacking bags on the market.

Western Mountaineering UltraLite (drying out)
The 20-degree Western Mountaineering UltraLite is a 3-season backpacking favorite

Cold-Weather Bags (20°F and Below)
You really have to know your gear and the conditions when climbing mountains or heading into the backcountry during the winter. For the purposes of this article, most of the bags on this list are of the 3-season variety and have temperature ratings from around 20 degrees to 34 degrees Fahrenheit. For winter camping, we’ve included the 0-degree Feathered Friends Snowbunting, and there are a number of options from climbing-centric companies like Western Mountaineering and Montbell that are rated down to 0°F or even lower. 

Double Sleeping Bag
A warm double bag can be a great choice in winter

The EN Rating System Explained

Instead of depending on the manufacturer and their marketing whims for a temperature rating, the Europeans have standardized the system. EN 13537 (or just EN for short) establishes guidelines for how to test the warmth of a bag and gives us two very important numbers:  

EN Comfort Rating: The temperature at which an average woman can sleep comfortably. Generally, women sleep colder than men, hence the importance of the comfort rating.

EN Lower Limit: The temperature at which an average man can sleep for eight hours without waking. We rarely sleep for eight hours without waking on a backpacking trip, but you get the idea.   

In addition, you may see references to the EN Upper Limit (the temperature at which an average man can sleep without excessive perspiration) and EN Extreme (the minimum temperature at which a standard woman can remain for six hours without risk of death from hypothermia). Of course, all of the EN ratings are based on averages and in general we've found them to be optimistic by around 10 degrees (we cover this in greater detail in the section below), but they are helpful in comparing two EN-rated bags. The majority of outdoor gear manufacturers use the EN system but certainly not all of them—compliance is optional. 

Backpacking Sleeping Bag EN rating
The EN Comfort, Lower Limit, and Extreme ratings

How the EN System Translates for You

First and foremost, we think that you should always leave a reasonable buffer in temperature so as to not to be disappointed (and save yourself sleepless nights). We've found the EN ratings to be too low, even when wearing a warm baselayer. For choosing the right EN rating, try to get an idea of the coldest temperature you'll be experiencing overnight. Check the weather forecasts and averages of areas you’re planning to visit to gauge the conditions. Once you have an approximate number, it’s a good idea to build in a buffer (we like 10 degrees) or more to avoid getting cold. Other factors to consider are your age (people typically don’t sleep as warm the older they get) and whether you are a cold or warm sleeper.

It’s also a good idea to have some extra clothing in case you need it. A warm hat can help keep a lot of heat in, and some wool baselayers will help add some warmth as well. And make sure to consider the R-value of your sleeping pad (more on this below), which will help to insulate you from the cold ground. Many people overlook their sleeping pad then become confused when their bag isn’t as warm as they had thought.

Nemo Riff (adaptable temp)
Nemo's Riff and Disco have a blanket fold and zippered gills to adapt to a variety of temperatures

What About Sleeping Bags Without an EN Rating?

Some manufacturers do not EN rate their sleeping bags, and typically it's smaller companies like Western Mountaineering, Feathered Friends, and Katabatic Gear. From our experiences, these brands actually are on the conservative side and take pride in offering very realistic temperature ratings. For example, the Feathered Friends Swallow 20 YF is a very warm bag and will keep the average man comfortable into the 20s, whereas the REI Radiant—with a 19°F Lower Limit EN rating—will be cold if the temperatures dip below freezing. As such, we've found that the higher EN Comfort rating is a better basis for comparison than the EN Lower Limit, and therefore have listed it in the table above (both ratings are included in the product specs). If anything, being cold can be uncomfortable or even dangerous, and we recommend using the EN Comfort as the more realistic of the two. If your bag ends up being a little warmer, take that as a bonus.

Feathered Friends Swallow Nano (morning)
We've found the Feathered Friends Swallow is warmer than a similarly rated EN bag

Down vs. Synthetic Insulation

The down vs. synthetic debate is not unique to backpacking sleeping bags. Midlayers, camping bags, and even sleeping pads are all insulated with these fill types. For a certain piece of gear or apparel, one has the leg up on the other, and for backpacking sleeping bags, we still give the clear edge to down fill. There are a few major reasons for that, including the best warmth-to-weight ratio, far better packability (i.e., a smaller compressed size), and a more premium warmth. The last one is a bit subjective, but it’s a clear consensus from us that down’s lofty warmth feels more luxurious. Down does vary in quality, which is measured in fill power (covered below), but even a mid-grade down fill is the superior insulator.

So why consider synthetic? The most common reason for most is price. Even a premium synthetic bag like the Nemo Forte 20 easily slides in under $200, while a nice down bag doubles that (and more). In addition, synthetic performs far better than down in wet weather. While there have been improvements in down’s performance in the wet thanks to the application of hydrophobic coatings on the feathers, synthetic will insulate far better if moisture enters the bag. So, for starting out, if you’re looking for a budget option, or you backpack in really wet conditions, synthetic bags remain a great choice. For an even more in-depth explanation of this topic, see our article on down vs. synthetic insulation.

Backpacking Sleeping Bags (Feathered Friends Tanager)
Testing the luxurious Feathered Friends Tanager down bag

Down and Synthetic Fill Weight

Fill weight is the actual amount of insulation stuffed into a sleeping bag. If it’s a close call between two bags with the same types of insulation (down or synthetic) and one or both don’t have EN ratings, you can compare fill weight to get a better idea of which one will be warmer. Cut does matter here: a bag with a slender cut may have less insulation than a bag with a roomy cut despite providing similar or even more warmth. Fill weight is more helpful for a category like down jackets, which don’t have EN ratings, but it’s good to know here too. And it's a good visual for how much more insulation is required for a synthetic bag to compete with down. For comparison, the Nemo Forte requires 15 additional ounces to achieve approximately the same temperature rating as the down-filled Disco.

Top Sleeping Bag Picks (stuff sacks)
Premium down offers amazing warmth and compressibility

Down Quality: Fill Power

If you decide down is going to be your insulation of choice, one of the first specs to look at is the quality of a specific down, known as its fill power. Specifically, it’s a measure of how much loft or fluffiness the down clusters have, and this correlates with warmth (note: both duck and goose down are measured in the same way). The highest down fill power is 900, and you’ll see cheaper sleeping bags closer to 500. Generally, the higher the fill power, the more expensive the sleeping bag. The lower the fill power, the more it must weigh to provide similar levels of warmth. High fill powers in the 800s are great, but don’t necessarily be turned off by 550 or 600-fill—it’s a great way to save money on an otherwise excellent bag.

Patagonia 850 Down Sleeping Bag (fill power)
Patagonia's sleeping bag uses a premium-quality 850-fill down

Hydrophobic Down

Unfortunately, down feathers lose much of their ability to insulate when wet, and synthetic insulation does a much better job in this department. Synthetic insulation, conversely, is much heavier, doesn’t pack down as small, and isn’t as warm, which are reasons that down is so prized. Gear manufacturers recently started treating down to make it more water resistant. Essentially, a polymer is added to the down before filling the bag, and the result is the feathers are better protected from the moisture and don’t clump up as quickly. In use, this means you don’t have to worry as much about brushes with moisture inside or outside of your backpacking tent. A number of companies have named their proprietary treated down such as Sierra Design’s DriDown, Mountain Hardwear’s Q.Shield Down, Marmot’s Down Defender, etc. 

Nemo Riff (waterproof)
Nemo uses hydrophobic down and waterproof panels around the feet to protect against moisture

We love the hydrophobic down movement. Yes, it adds a tiny bit of weight to the down, but it also adds a noticeable level of protection. Synthetic insulation still has its place for budget backpackers but nothing beats down, and particularly treated down. If you’re headed out in a wet area like the Pacific Northwest or New Zealand, buying a sleeping bag with hydrophobic down is a wise move. Fortunately, many manufacturers are moving in this direction, and it’s now the majority instead of the minority. 

Dimensions: Cut and Length

In addition to considerations like warmth and down fill, the cut of a sleeping bag is critical to how much you enjoy it. The three most common points of measurement for sleeping bags are at the shoulders, hips, and feet (59"/51"/38", for example), which give you an idea as to how roomy or tapered the bag is.

Patagonia 850 and Nemo Rift
The regular-length but roomy Nemo vs. the long version of the Patagonia 850

Many ultralight sleeping bags save weight by tapering the cut of the legs for less fabric and down. If you toss and turn at night or just prefer more space, make sure to consider a roomier bag (the spoon-shaped Nemo Disco 30 is a great example). The downsides are that these bags can feel draftier and may not retain heat quite as well, and often weigh more because more fabric and insulation are required to fill the larger surface area. The good news is that many manufactures make the same bag in varying widths. The Western Mountaineering Alpinlite is the wider version of the UltraLite, for example.

In terms of length, most sleeping bags come in two or three lengths that are meant to fit men and women of varying heights. For men’s bags, the regular size often is 72 inches long and the tall is 78 inches long. If the bag doesn’t have a women’s-specific version, you’ll often see a short 66-inch option. If you are on the border and want the hood to extend over your head, it’s a good idea to size up. Keep in mind that larger sizes do cost and weigh more and have a larger packed size.  

Women’s-Specific Sleeping Bags

Some backpacking bags have a women’s-specific version with a different name, and others simply have a “short” version of the same bag. What can you expect with a women’s-specific bag? They usually have a slightly different cut than men’s or unisex models that is narrower at the shoulders and roomier around the hips. Further, the bags will have a little more insulation, and often in targeted areas (Therm-a-Rests’s Adara HD, for example, has a foot warmer pocket at the bottom of the bag to fight the common problem of cold feet). And as is typical in outdoor gear, women’s sleeping bags often come in what are considered to be more feminine colorways. All in all, we know women that buy women’s bags and others that buy men’s or unisex bags when they fit. The differences are small and it’s mostly a matter a taste.

Therm-a-Rest Adara HD women's bag
The foot warmer pocket on the women's-specific Therm-a-Rest Adara HD


Along with your tent, your sleeping bag is one the heaviest and bulkiest items in your pack. Sleeping bags run the gamut from around 1 pound for a true ultralight up to 2-3 pounds or more for less expensive options (for a comprehensive list, see our sleeping bag weight comparison chart). Like other gear categories, down is king in the lightweight sleeping bag world, and premium fill power (800+) is ideal if you're willing to pay for it. Make sure to keep an eye on the whole package as weight often is saved by using thinner shell fabrics and a trimmer cut. Ultralight sleeping bags are great for some people but certainly not necessary for everyone. 


Outside of the premium warmth and low weight you get from down, another selling point is compression. Natural goose and duck feathers stuff down in a way unmatched by anything manmade, although the synthetic Lamina bags are a significant improvement in this area. In general, higher-end down bags like the Feathered Friends Swallow 20 YF, will be the most compressible due to their quality of the down and use of thinner fabrics. A cheap synthetic bag will be the least compressible option. Other indicators include the cut of the bag—a tapered cut will trim fabric and stuffed size—as well as the temperature rating. Summer bags can get away with using less insulation and will be more compressible as a result.

Backpacking Sleeping Bags (Hyperion stuffed down)
Therm-a-Rest's Hyperion 20 has a tiny packed size

To take full advantage of the small stuffed size potential of your sleeping bag, you’ll want to pick up a compression stuff sack. Most sleeping bags these days only include a non-compressible stuff sack. One of our favorites, thanks to its creative waterproof construction, is the Sea to Summit eVent Compression Dry Sack. Take care when using a compression stuff sack—cinching it down too much can damage the insulation over time. It’s a better idea to lightly compress the bag so that it fits easily into your pack and not overdo it. And don’t store your sleeping bag in a compression sack for extended periods.

Sleeping Bags vs. Quilts

This article is about backpacking sleeping bags and quilts really are a separate category, but we have included a couple of our favorites for those who are interested. Essentially, a sleeping quilt is a minimalist backcountry sleep system popular among ultralighters and thru hikers. You technically can sleep in a quilt like a normal sleeping bag, but the narrow design favors opening up the back and connecting it to your sleeping pad (make sure to get a pad with the proper R-value for insulation). The end result cuts weight significantly and comfort too.

The sleeping bag vs. quilt debate comes down to personal preference. Certain people swear by quilts and love that they can shave even more ounces off the total weight of their pack. We’ve found that quilts aren’t as comfortable as mummy bags and have their downsides. You have to bring proper head coverage, which can add weight, the quilt/sleeping pad system isn’t perfect, and it takes a bit of time to set up each night. All in all, we prefer the coziness and simplicity of a lightweight mummy bag for most of our backpacking trips, but quilts are a viable option too. 

Sleeping bag vs. Quilt
Katabatic Gear's Flex 22 quilt next to the Patagonia 850 Down sleeping bag

Your Sleeping Pad R-Value Matters

We’ve written a lot about the temperature rating of your sleeping bag, but remember that your sleeping pad matters too. Keep an eye on the R-value, which is a measurement of how well the pad insulates you from the ground. R-values range from 1.0 (almost no insulation) to 9.5 (winter-ready warmth). A summer backpacker can get away with a low R-value, while the average 3-season backpacker should look for something in the 3 range or more. A true winter camper will want an R-value that exceeds 5 depending on the conditions. For more information, see our article on the best sleeping pads for backpacking.
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