Osprey Atmos AG 65

Price: $270
Weight: 4 lbs. 9 oz. (men's medium)
Fabric: Nylon (100D x 630D)
Capacities: 50, 65L
What we like: Fantastic ventilation, close and supportive fit, and durable build.
What we don’t: No zippered access to the main compartment; hipbelt caused discomfort for some testers. 
See the Osprey Atmos AG 65  See the Women's Osprey Aura AG 65


One of the few downsides in the industry-wide transition to internal-frame packs is ventilation. Enter the Atmos line from Osprey, and more recently, the Atmos AG pack. This bag has been designed from the ground up to keep your back dry without sacrificing load capacity and comfort. After a number of backpacking trips, including multiday treks in hot weather in Utah and a late winter trip into the Grand Canyon, we’ve come away very impressed. Not only does the pack offer excellent ventilation, but it’s a standout performer in nearly every category. Below are our thoughts on the Atmos AG's carrying comfort, weight, organization, ventilation, fit, and more. To see how the Atmos stacks up, see our article on the best backpacking packs.


Carrying Comfort

When I slid on the Osprey Atmos AG 65 for the first time, I was struck with how well it fit. The mesh backpanel and hipbelt naturally want to fold inwards, which means the pack practically hugs you. It makes a strong first impression, and we’ve found it to be very comfortable even after logging serious miles on a number of overnight and extended trips (loads varied from around 25 to 40+ pounds). Even though the sculpted backpanel does pull the load a little bit away from you, we never felt any disconnect, nor the sensation of the weight pulling us backwards (although it did take one of our testers some time to get used to).Osprey Atmos AG 65 (hiking 5)

But despite the Atmos’ overall comfort, the stiff hipbelt raised some concerns. During an extended trip along the Grand Canyon’s Escalante Route, one tester reported notable discomfort at the edges, which roll slightly inwards, after only a day wearing the pack. Compared to the shoulder straps and the rest of the belt, this area is relatively unpadded, creating pressure points that continued throughout the rest of the journey. Some might not experience the same issue depending on where the pack falls (and there’s plenty of room for adjustment), but it was noticeable enough for us to call out directly.Osprey Atmos AG 65 (suspended mesh)

Finally, the Atmos AG is not our absolute favorite pack for carrying a heavy load (45-plus pounds)—that honor is reserved for options like the Gregory Baltoro, REI Co-op Traverse 70, and Osprey’s own Aether AG. But the Atmos holds its own on multiday treks. Even on trips where we’ve brought along extra water, camera equipment, or items for gear testing, its sturdy frame has kept us quite comfortable. This is all despite using a suspended mesh hipbelt design rather than thick foam—a testament to the Anti-Gravity technology.Osprey Atmos AG 65 (hiking)


At 4 pounds 9 ounces in a medium frame, the Atmos AG is competitively lightweight for what we consider a luxury pack. Construction and features vary widely even among backpacks of a similar capacity: on one end of the spectrum are the ultralights (around 2-3 pounds) that only have a couple pockets and are made with very thin materials; and at the other are traditionalist packs with premium features and durable fabrics at the cost of weights that creep towards 5 pounds. The Atmos AG falls towards the premium side, although at 4 pounds 9 ounces, it’s not excessive (the very popular Osprey Aether AG 70 weighs 5 pounds 3.4 ounces). For those looking to trim weight, you can leave behind the top lid and use the attached “FlapJacket” to cover the main compartment. In the end, considering how well it can carry a load exceeding 40 pounds, we feel the empty weight is completely reasonable.Osprey Atmos AG 65 (hiking 2)


If organization is a priority, the Osprey Atmos AG 65 is well-appointed with plenty of pockets, lash points, and gear loops. To start, you get the standard array of two zippered pockets in the top lid, two mesh water bottle holders, a sleeve for a water reservoir, and a very large mesh stuff-it pocket along the front of the pack. There’s also a dedicated sleeping bag compartment with its own zipper at the base of the pack, which is really helpful for staying organized and often omitted in lighter designs. And when the terrain gets tricky, a trekking pole attachment point along the shoulder strap makes it easy to free up your hands.Osprey Atmos AG 65 (shoulder straps)

The features we’ve found most convenient are the zippered pockets that flank the large mesh front pocket—they’re quite large and can swallow bulky items like a water filter, rain jacket, or extra fuel canisters—and the two hipbelt pockets. These too are on the big side and should easily accommodate a modern smartphone in a case (we were even able to fit a point-and-shoot camera in its case).Osprey Atmos AG 65 (hipbelt pocket)

One area for improvement would be a zippered access into the main compartment. The Atmos has a standard top-loader design, which makes it a pain to dig through and find an item that’s hidden deep inside, although the zippered sleeping bag compartment at the bottom helps some. Adding another zipper would tack on some ounces to the total weight, but we’ve come to appreciate the quick and easy access to the main compartment you get with this feature.Osprey Atmos AG 65 (at camp)


The big news here is along the back—one large suspended mesh panel covers the entire backpanel and hipbelt of the Atmos AG. Dubbed Anti-Gravity (hence the AG in the name), even the shoulder straps have the same open webbing. Simply put, we haven’t worn a pack that encourages this much airflow. And expanding the concept to the hipbelt is seamless. If your number one consideration in buying a backpacking pack is ventilation, the Osprey Atmos AG is the one.Osprey Atmos AG 65 (backpanel)

Build Quality and Durability

What takes the Atmos’ ventilating design from merely good to great is the fact that it doesn’t compromise the rest of the backpack. It’s simply another quality Osprey item: the pack can haul a multi-day load in comfort, has thoughtful organization, and is made with durable materials that haven’t shown any signs of excessive wear over extensive use. The curved backpanel, which creates the open space for air to reach your back, does cut into the main compartment a little, but it’s still easy to fit large items like a standard bear canister inside.Osprey Atmos AG 65 (front pocket)

Fit and Sizing

The Osprey Atmos AG 65 is offered in three different sizes (small, medium, and large), and we’ve found it very easy to dial in a nice fit. As mentioned above, the bag conforms nicely to your back, and adjusting the shoulder straps is as simple as sliding them up and down along the backpanel. Additionally, the light foam padding along the hipbelt can be moved in or out to increase comfort. We had no issues sharing our medium-sized pack between two testers with 18- and 21-inch torsos.Osprey Atmos AG 65 (side profile)

Women’s-Specific Osprey Aura

We tested the men’s Atmos AG, but Osprey also makes the pack in a women’s version, the Aura AG. Like the Atmos, the Aura comes in 50 and 65-liter capacities, but it offers a female-specific fit and different color options (for more, see our in-depth Aura AG review). Importantly, the two designs share the Anti-Gravity system and key features such as the pocket layout, high-quality fabrics, and attachment points for trekking poles and an ice axe.Osprey Atmos AG 65 (river)

What We Like

  • A thoughtfully designed and well-implemented ventilation system.
  • Solid carrying comfort, despite not relying on thick foam padding for support.
  • Good organization overall, with large pockets to divvy up gear.
  • High-quality materials do a great job balancing weight and durability.

What We Don’t

  • Zippered access to the main compartment would make it easy to grab items that aren’t at the top or in the bottom sleeping bag compartment.
  • Hipbelt edges are relatively unpadded and roll slightly inward, which can cause discomfort during long days on the trail.
  • The pack has developed a noise around the hipbelt that is occasionally noticeable when on the go—it resembles a low-pitched groan.

Osprey Atmos AG 65 (top lid)

Comparison Table

Pack Price Weight Fabric Capacities Access Pockets
Osprey Atmos AG 65 $270 4 lb. 9 oz. Nylon (100D x 630D) 50, 65L Top 8 exterior
REI Co-op Traverse 70 $249 4 lb. 14 oz. Nylon (200D & 420D) 35, 70L Top, front 11 exterior
Granite Gear Blaze 60 $270 3 lb. 0 oz. Nylon (100D & 210D) 60L Top, front 6 exterior
Gregory Baltoro 65 $300 4 lb. 13.4 oz. Nylon (210D) 65, 75, 85L Top, front 9 exterior
Osprey Aether AG 70 $310 5 lb. 3.4 oz. Nylon (210D & 500D) 60, 70, 85L Top, front 7 exterior

The Competition

As a high-capacity ventilation pack, the Atmos AG stands alone as our top pick. But you do pay a slight premium for the Anti-Gravity suspension, and there are a number of other excellent backpacking models to consider. REI Co-op's Traverse 70 has long been a favorite of ours, and their most recent version uses a creative compression system for keeping the load close to your back (see our in-depth review here). It’s cheaper ($249) than the $270 Atmos, but its backpanel isn’t as comfortable, and it weighs an extra 5 ounces. The other part of the decision may come down to how highly you prioritize ventilation—the Traverse falls a little short of the Atmos in that respect.

Another favorite pack of ours this season is Granite Gear’s Blaze 60. At just 3 pounds, the Blaze significantly undercuts the 4-pound-9-ounce Atmos but doesn’t sacrifice much in the way of carrying comfort, hauling capability (it’s rated for 50 pounds), or organization. Additionally, we love the convenience of the Blaze’s hidden front zipper for quick access to the main compartment (a feature the Atmos omits). However, the Blaze isn’t as breathable or durable as the Atmos. All told, the Granite Gear pack is a great choice for weight-conscious backpackers who don’t mind those drawbacks, but the Atmos is the slightly more well-balanced design.Osprey Atmos AG 65 (hiking 7)

For carrying a very heavy load, the Gregory Baltoro 65 as well as the Osprey Aether AG 70 are slightly better options. Starting with the Baltoro, you get zippered access to the main compartment (a notable omission with the Atmos AG), as well as generous padding, an integrated rainfly, and excellent organization. However, the feature-rich design does add some weight at 4 pounds 13.4 ounces. Both are capable choices for long days on the trail, but we’d break it down as follows: for comfort above all else, get the Baltoro; the Atmos gets the nod as the better all-around option for most overnight and multi-day trips.

Osprey’s own Aether AG 70 is a final option to consider. As its name implies, the Aether shares the same Anti-Gravity backpanel as the Atmos. However, the Aether is aimed more towards backpackers carrying a lot of weight or light mountaineering, with a heat-moldable foam hipbelt that adds support for heavy hauling. The Aether also adds features like a J-shaped zipper to access the main compartment and a removable top lid that converts into a handy daypack for summit pushes or short outings from camp. You pay the price in both weight (5 pounds 3.4 ounces) and cost ($310), but the Aether has its place for those shouldering serious weight or who like the extra features. In most other cases, we’d go with the lighter Atmos.

If you’re thinking about buying gear that we’ve reviewed on Switchback Travel, you can help support us in the process. Just click on any of the seller links above, and if you make a purchase, we receive a small percentage of the transaction. The cost of the product is the same to you but this helps us continue to test and write about outdoor gear. Thanks and we appreciate your support!

Depending on the seller, most products ship free in the United States on orders of $50 or more. International shipping availability and rates vary by seller. The pricing information on this page is updated hourly but we are not responsible for inaccuracies.

Best Backpacking Packs of 2020

Gone are the days when backpacking consisted of strapping on a huge external frame and lumbering through the forest with an aching body. Trends in backpacks these days err towards minimalism...

Osprey Aether AG 70 Review

Osprey has a strong reputation for building comfortable packs, and the Aether line is one of their best. To see how it performed, we loaded down the 70-liter model for a multi-day trip in Southern Utah. All in all, we were impressed by its performance...

Backpacking Checklist for 2020

Whether you are a first-time backpacker or a seasoned veteran, everyone likes a good list. Our detailed backpacking checklist below covers everything from critical equipment (tent, pack, sleeping bag, etc.)...

Backpack Fit and Sizing Guide

Your pack is arguably the most important piece of gear in your backpacking kit, and a proper (or improper) fit can make or break your time spent in the backcountry. It all starts with nailing the size, which can then be...

Best Trekking Poles of 2020

Serious hikers have known the great benefits of trekking poles for decades. Aside from providing stability while hauling a heavy load or moving over technical terrain, trekking poles have distinct advantages even on easy trails. They’re great for...

Best Backpacking Stoves of 2020

Backpackers need a stove that is lightweight, dependable, and will get the job done quickly after a long day on the trail. Thankfully, the market is full of both time-tested models and newer...

Osprey Aura AG 65 Review

Osprey’s proven lineup of backpacking packs runs the gamut from simple entry-level haulers and ultralight builds to premium, feature-rich models. The Aura AG—and its men’s counterpart, the Atmos AG—falls right in the middle...

Best Hiking Boots of 2020

Hiking boots are critical to your comfort and performance on the trail, but this no longer means a stiff and burly model that will weigh you down. The trend is toward lighter materials that still offer decent support, and waterproof boots...