Osprey Eja 48

Price: $200
Weight: 2 lbs. 8 oz. (women’s small)
Fabric: Nylon (100D & 210D)
Capacities: 38, 48, 58L
What we like: Great organization in a lightweight package.
What we don’t: Limited load-carrying ability, subpar waist cushioning, and no hipbelt pockets.
See the Osprey Eja 48  See the Men's Osprey Exos 48


The minimalist Exos has been a mainstay among ultralight packs for years, and the newer women’s-specific Eja is similarly competitive. Going beyond the “shrink and pink” strategy, the Eja is a well-fitting, adjustable pack that comes in 38, 48, and 58-liter options. I took the 48-liter version backpacking and mountaineering in New Zealand’s Southern Alps and came away impressed by its ease of use, build quality, and versatility. However, the minimalist padding on the hipbelt and around the lower back was a letdown in terms of comfort. Below are my thoughts on the Eja 48’s overall performance. To see how it stacks up, see our article on the best backpacking packs.

Table of Contents



Listed at 2 pounds 7.2 ounces (my size small weighs slightly more at 2 lbs. 8 oz.), the Osprey Eja 48 is impressively lightweight considering its features and nylon construction. The pack undercuts popular options like the REI Co-op Flash 55 (2 lbs. 10 oz.), Gregory Maven 45 (3 lbs. 3.7 oz.), and Osprey’s own Aura AG 50 (4 lbs. 1.6 oz.). You can save a bit of weight with the Osprey Levity/Lumina line (the Lumina 45 weighs 1 lb. 12.6 oz.), but it costs $50 more and has a lower weight capacity. All told, the Eja should be plenty light for most minimalist adventurers and thru-hikers. Osprey Eja (scrambling)

To reduce the Eja’s weight even further, you can remove the lid and use the otherwise redundant FlapJacket to cover the top of the pack. For extremely weight-conscious packers, the compression and accessory straps can also be taken off. Though I removed the lid while wandering from camp on day trips, I preferred to keep the compression straps in place to tighten down a light load. With only the top lid removed, the weight saving is 4.3 ounces, bringing my pack to just under 2 pounds 4 ounces. Osprey Eja (water)

Carrying Comfort

I have mixed feelings when it comes to the Osprey Eja 48’s carrying comfort. Above the waist, the pack is incredibly comfortable for its minimalist nature. At its foundation, a lightweight 4-millimeter alloy frame ensures the pack’s shape and stability without adding excess ounces. The AirSpeed mesh backpanel is form-fitting and supportive and (as covered below) offers class-leading ventilation. The shoulder straps are made of Exoform, a thick ventilated padding, and fall exactly where they should without causing unnecessary strain or rubbing on the neck or shoulders. And the sternum strap is on a slider, allowing for full customization—an often overlooked feature that can be a deal-breaker, particularly for women.

Unfortunately, my experience with the Eja’s hipbelt was less positive. The AirSpeed backpanel is unpadded, even at its base, and the minimalist hipbelt offers limited cushioning. Even with loads as light as 20 pounds, a few days of carrying the pack left me with bleeding pressure sores and chafing on my lower back. I had to consistently tuck my hands under the shoulder straps and lift the load off my hips to reduce the pressure. I am not a backpack rookie, have become accustomed to the wear-in period associated with new bags, and had never suffered serious chafing until the Eja. Though I am quite bony, my shape is not atypical amongst the backpacking cohort. To be blunt, my scars make me unlikely to choose the Eja again despite its other notably strong features. Osprey Eja (shoulder strap)

Organization and Pockets

Like many modern backpacking packs, the Osprey Eja 48 features a simple top-loading main compartment with an internal hydration reservoir sleeve. On the outside, a lid and three external pockets make the Eja a great match for those who like to stuff items in pockets and strap gear to the outside. The stretchy mesh material on the front and dual access side pockets make packing clothing, food, and other items simple and quick. I could easily retrieve and stow gear like gloves and sunscreen without taking off the pack. Rounding out the pockets, there are two on the lid: one external and one on the underside with a clasp for keys. To shave off a few ounces, Osprey removed the pockets on the hipbelt and shoulder straps from the previous version of the Exos, a disappointment to many who enjoyed the convenience of these features.
Osprey Eja 48 (field)

To further assist with organization, there are a number of accessory cord attachment points for easy packing of a climbing helmet, camp shoes, or other bulky items. Additionally, the Eja features side compression straps, removable straps on the front (intended for a sleeping pad), and an ice-axe attachment and bungee tie-off that held my tool securely on our trek through the Southern Alps. And finally, you get Osprey’s “Stow-on-the-Go” trekking pole attachment system, which secures the poles along the left side of the pack.
Osprey Eja (ice axe bungee)


The Osprey Eja 48 is a standout pack in terms of ventilation, in large part due to its AirSpeed suspension. This tensioned mesh backpanel creates an open space between your back and the main compartment, allowing air to flow freely between the two. The added breathability is obvious—even after a grueling climb in the humid New Zealand summer, my back remained dry and my shirt did not take on that characteristic sweat shadow. Additionally, dual mesh on the shoulder straps and hipbelt ensures airflow in and out of the light padding. In short, it’s hard to find a more ventilated pack than the Eja. That being said, as I touched on above, I would gladly trade a drop in ventilation for improved carrying comfort.
Osprey Eja (backpanel)

Build Quality and Durability

Made with thru-hikers in mind, the Eja’s design attempts to strike that tricky balance between ultralight yet durable. For the most part, it pulls this off pretty well. The Eja is made with 210-denier (D) nylon along the bottom of the pack and 100D nylon in the body. For comparison, Osprey's Aura AG uses a combination of 100D and 630D nylon and their ultralight Lumina uses 210D x 200D and 30D. I am not easy on gear, and surprisingly the Eja has held up (we have put holes in the 100D body of the men’s Exos, however). Although the stretch mesh of the pockets ripped fairly easily—from stowing angular items such as a camera—the small abrasions have not compromised the utility of the pockets and a simple patch job would be sufficient to fortify the tear. Furthermore, the zippers, buckles, compression straps, ice-axe loop, and other attachment points show no signs of wear.
Osprey Eja (climbing down)

Fit and Sizing

The Osprey Eja 48 comes in three sizes: extra small, small, and medium. I opted for a small (bringing the volume down to 45 liters rather than the advertised 48 liters), and it fit my thin 5’7” frame perfectly. Although the height of the shoulder straps is not adjustable, they were ideally shaped for my body and created no undo pressure. I also found the adjustable sternum strap to be very functional. Many of my previous packs have shoulder straps that sit too widely and pull uncomfortably, but Osprey has this fit dialed. 

As I mentioned in the carrying comfort section above, I experienced a great deal of chafing on my lower back from the hipbelt and backpanel. I’m fairly certain this was not a result of the pack not fitting well, as the weight rode evenly and the padding of the hipbelt rested directly over my hips. That said, the hipbelt is not as adjustable as some might need. The padded portion is attached to the backpanel of the bag, and some will find that it extends around the body only far enough to cover a portion of their hips. Sizing up might solve the problem, but it might then create fit issues elsewhere. In sum, I wish Osprey made the Eja with adjustable padding on the hipbelt.
Osprey Eja (break)

Other Capacities of the Osprey Eja

The Eja comes in 38, 48, and 58-liter models. All three packs have the same design, pocket layout, and suspension systems. Osprey specifies a load range of 15-30 pounds for the 38-liter model and 20-40 pounds for the two larger versions. The 48 hit a sweet spot for my needs on minimalist multi-day trips, while the Eja 38 has appeal for day hikes when you need to carry a lot of gear or ultralight overnighters. And the highest capacity 58-liter option is a popular choice among backpackers and thru-hikers. Surprisingly, the packs do not vary much in weight—the Osprey Eja 58 tips the scales at only 2.3 ounces heavier than the 38-liter model.

Men’s-Specific Osprey Exos

The women’s-specific Eja was introduced in 2018, but its men’s counterpart, the Osprey Exos 58, has been a staple of the brand's pack lineup for years. The Exos is offered in the same three capacities as the Eja, featuring a nearly identical design, suspension system, and load ranges. It comes in three sizes (small, medium, and large) with larger torso and hipbelt measurements in slightly different shapes to accommodate broader frames. The Exos is available in black/red and green colorways. The most recent version boasts a few updates from the previous Exos, including a redesigned hipbelt, increased durability along the front stretch pocket, and a few added ounces. However, Osprey did away with the pockets on the shoulder straps and hipbelt for this iteration.
Osprey Eja (glacier)

What We Like

  • Great organizational features and fit for such a lightweight pack.
  • The stretchy exterior pockets are very convenient for stowing and retrieving gear on the go, even while wearing the bag.
  • The suspended mesh backpanel and dual mesh foam padding offer impressive ventilation.
  • Made in men’s and women’s-specific designs.

What We Don’t

  • The Eja’s weight capacity maxes out at 40 pounds, and many will find its comfort begins to wane even around 20 pounds. If you’re not traveling with ultralight gear, consider a pack with a more padded hipbelt.
  • The backpanel and hipbelt caused chafing and pressure points on my lower back. Make sure the pack doesn’t irritate you here, as this could be a deal-breaker. 
  • Osprey removed the pockets on the shoulder straps and hipbelt in the 2018 update of the Exos/Eja.

Osprey Eja (ridge)

Comparison Table

Pack Price Weight Fabric Capacities Access Pockets
Osprey Eja 48 $200 2 lb. 7.2 oz. Nylon (100D & 210D) 38, 48, 58L Top 5 exterior
Granite Gear Crown2 60 $200 2 lb. 4.2 oz. Nylon (100D & 210D) 60L Top 6 exterior
REI Co-op Flash 55 $199 2 lb. 10 oz. Nylon (100D & 420D) 45, 55L Top 9 exterior
Osprey Lumina 45 $250 1 lb. 12.6 oz. Nylon (210D & 30D) 45, 60L Top 4 exterior
Gregory Octal 45 $190 2 lb. 6.2 oz. Nylon (100D & 210D) 45, 55L Top 3 exterior
Gregory Maven 45 $200 3 lb. 3.7 oz. Nylon (210D & 100D) 45, 55, 65L Top 6 exterior

The Competition

We were very happy to see that Osprey finally added the women’s-specific Eja to their lineup, but it joined a growing and formidable field of ultralight pack options. A notable standout is the Granite Gear Crown2 60, which we tested in Patagonia. Both packs provide functional organization and decent durability with their strategic use of tough, 210-denier nylon. But the Osprey is offered in more capacities (the women’s version of the Crown2 only comes in a 60L model), and the Eja is the better back ventilator. Overall, however, we prefer the Granite Gear design. It weighs about 3 ounces less compared to the Eja 58, has better cushioning on the hipbelt and around the lower back, and includes practical features like hipbelt pockets (for more information, see our in-depth Crown2 60 review).

Another pack worth a serious look is the REI Co-op Flash 55. The Flash boasts a slightly higher weight than the Eja 48 at 2 pounds 10 ounces but adds 7 liters of capacity and includes strippable features like a removable top lid and compression straps. We tested the higher-capacity Flash on a backpacking trip into the Grand Canyon and found that it also was an excellent ventilator and easily supported a full load. It’s a close call between these two capable packs, but the Flash’s better hauling credentials and inclusion of hipbelt pockets—for the same price as the Eja and with only a slight weight penalty—give it the edge for us.Osprey Eja (slope)

From within Osprey’s own lineup, another pack to consider is their Lumina 45 (and men’s Levity), which targets minimalist trekkers and thru-hikers. The basic design shares a lot in common with the Eja, including the suspended mesh backpanel and pocket layout, but in a trimmed-down form. At 1 pound 12.6 ounces, the Osprey Lumina 45 is about 10 ounces lighter, and the 210D x 200D hybrid nylon protecting the bottom and lower 2/3 of the pack is surprisingly tough. The Lumina does compromise in durability, however, with exposed areas of extremely thin 30D silnylon on the rest of the bag. If you’re able to get a comfortable fit with the Eja, it has the higher weight capacity at 40 pounds (the Lumina is only rated for 20-25 lbs.), but otherwise we think the Lumina is the better design. Its combination of a strong metal frame, useful organization, and ventilation at a sub-2-pound weight is truly impressive.

Gregory is another leader in pack design, and their Octal 45 is a close competitor to the Eja 48. For $10 less than the Osprey, the Octal checks in at a competitive 2 pounds 6.2 ounces (an ounce less than the Eja) and boasts a metal frame and supportive padding around the waist and shoulder straps that carry a load impressively well. We also love the addition of a rain cover and hipbelt pockets, both of which the Eja lacks. The Osprey does get the overall edge in build quality—we found the buckles on the men’s version (the Gregory Optic) to be cheap-feeling during testing and actually had one break—but the Gregory wins out in most other categories and strikes us as the more well-rounded design.

Last but not least is another Gregory pack: their Maven 45 (the men’s version is called the Paragon). Right off the bat, we’ll note that the Maven is considerably heavier than the packs above at 3 pounds 3.7 ounces (for a women’s extra small/small). However, the jump in weight comes with some notable upgrades: you get ample organization including six exterior pockets, an included rain cover, easy fit adjustments, and a supportive and well-cushioned build for loads of up to around 35-40 pounds. We also appreciate the full-length side zipper, which offers far easier and quicker access to the main compartment than the top-loading Eja. Given these advantages, we consider the Maven the better-built option for most backpackers. If your main priority is shaving weight, however, the Eja remains a popular UL pick.

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