Osprey Exos Pro and Osprey Eja Pro Backpacking Backpack Review
a Fully-featured 2-lb backpack with excellent frame and ventilation
Thru-hiking the Trans Catalina Trail with the Osprey Eja Pro pack. Photo by Kate Hoch.
August 8th, 2024
Our verdict
The Osprey Exos Pro 55 (men’s) and the Osprey Eja Pro 55 (women's) are our favorite lightweight backpacking backpack for ventilation. The Exos and Eja were the most popular packs we saw on the Colorado Trail this year and have for years been among the most popular packs on thru-hiking trails.
The Exos and Eja Pro version is designed for backpackers who value saving almost a pound off the original version without compromising features and the ventilation of the original series. The Pro series is an even lighter version of a long-time backpackers' lightweight favorite and is worth it for those going the distance.
Backed with Osprey's impressive lifetime warranty, this is a lightweight pack with a well-balanced and comfortable carry, exceptional ventilation, and many features you'd find in a heavier pack.
As a result, the Exos Pro and Eja Pro are winners in our Best Lightweight Backpacking Backpacks guide.
One of our testers has backpacked and thru-hiked extensively with ultralight packs and has always found his back covered in sweat. He tested the Exos in the Mojave Desert and had an "ah ha" moment. He could feel a breeze against his back–a first for a lightweight pack. He fully admits that it doesn't mean his back wasn't sweaty (it still was) but that this was the coolest he's felt with a backpack.
Over more than a year, we tested the Pro series while backpacking in the Mojave Desert, Anza Borrego Desert, numerous trips in the Eastern Sierra near Yosemite, and two thru-hikes of the Trans Catalina Trail. After desert hikes, big climbs, and big miles, we think the Osprey Exos and Eja Pro packs are comfortable options for folks who sweat a lot and want the best ventilation possible in a lightweight backpacking backpack.
Men's
Women's
We create reader-supported, objective gear reviews independently selected by our editors. This story may contain affiliate links, which help fund our website. When you click on the links to purchase gear, we may get a commission — without costing you an extra cent. Thank you for supporting our work and mission of outdoor coverage for every body! Learn more.
Specs
Capacity: 55 L (S/M), 58 L (M/L)
Weight:
Men's S/M: 2.07 lbs
Men's M/L: 2.16 lbs
Women's S/M: 1.92 lbs
Women's M/L: 2.06 lbs
Max load: 40 pounds
Materials: 100 & 200 denier Robic high-tensile strength nylon
Max Recommended Weight: 30 lbs
Main Body Pockets: 1 large front pocket
Water Bottle Pockets: 2 (each holds 2 Smart Water bottles)
Hip Belt Pockets: 2 zippered
Shoulder Strap Pockets: No, can attach straps from other brands
Suspension: AirSpeed Suspension
Load Lifters: Yes
Compression System. Yes
Roll Top Closure: Yes
Gender: Unisex
Ice Axe/Trekking Pole Attachment Point: Yes
Bear Canister Capability: Yes, BV500 fits
Torso Lengths: 17-23" (men's) 13"-20" (women's), both with adjustable torso for further fine-tuning
What we liked
A fully-loaded pack on the Trans Catalina Trail with the Osprey Eja Pro pack. Photo by Kate Hoch.
Unrivaled ventilation and airflow on the back that keeps you cooler and less sweaty
Comfortable suspension that moves with you
Generous and secure pockets for organization
Dual access side pockets for grab bottles while on the move
What we didn't like
Lower denier fabric can be susceptible abrasion, especially for people less careful with their gear
The top of the pack rides against the back of the head, which can inhibit 360-degree head movement or wearing full-brimmed hats
Front pocket lacks the stretch and capacity of other lightweight backpacks
Comparison table
| BACKPACKING BACKPACK | TREELINE AWARD | MSRP | VOLUME (L) | MATERIALS | WEIGHT (LBS) | MAX LOAD (LBS) |
|---|---|---|---|---|---|---|
| Six Moon Designs Swift X | Best overall Read why |
$375 | 56 | LiteSkin LS21 or EPX 200 | 2.4 | 35 |
| Gossamer Gear Mariposa | Best for thru-hiking Read why |
$315 | 60 | 100 & 200 denier Robic high-tensil strength nylon | 2.0 | 35 |
| Hyperlite Mountain Gear Junction | Best dyneema Read why |
$349 | 40, 55 | DCH50 (main body) and DCH 150 (bottom), or DCH150 | White: 1.9 Black: 2.0 | 40 |
| Granite Gear Crown3 60 (men's) | Best budget Read why |
$240 | 60 | Robic® High-tenacity nylon (100D and 210D) with Barrier DWR | 2.4 | 35 |
| Granite Gear Crown3 60 (women's) | Best women's budget Read why |
$240 | 60 | Robic® High-tenacity nylon (100D and 210D) with Barrier DWR | 2.4 | 35 |
Updates: Osprey Exos/Eja vs. Osprey Exos/Eja Pro
Capacity: 58 (S/M), 61 L (L/XL) (men’s), 55 (XS/S), 58 (M/L) (women’s)
Weight:
Men's S/M: 2 lbs. 13 oz.
Men's L/XL: 2 lbs. 15 oz.
Women's XS/S: 2 lbs. 11 oz.
Women's M/L: 2 lbs. 13 oz.
Max load: 35
Cost: $260
The original Osprey Exos 58 and Eja have long been one of Osprey's lightest backpacking backpacks and a favorite among thru-hikers. They recently came out with the Exos Pro and Eja Pro, which are even more lightweight versions, shaving nearly a pound off the traditional version.
As we first reported in our Gear News section, they've managed to shave nearly a pound off the previous versions, but still maintain an impressive list of features. While the Exos and Eja are still available, we think the Pro version is the way to go.
One way the Pro series has saved weight is by using a lightweight fabric. Our testers had some concerns with the durability, particularly with hardware pieces like buckles. Still, after backpacking in Yosemite, the Eastern Sierra, San Gabriel mountains, the Mojave Desert, and Anza Borrego Desert, thru-hiking the Trans Catalina Trail twice, the Osprey Eja Pro still looks brand new.
View the Osprey Exos/Eja
Men's
Women's
Features of the exos and eja pro
Backpacking with the Osprey Eja Pro pack in a big snow year in Yosemite National Park. Photo by Liz Thomas.
Tensioned mesh back panel increases air circulation
The unique AirSpeed suspension system keeps the pack off your back, allowing excellent airflow. This lightweight pack has a drastically curved back. This allows any sweat that may accumulate on the back to evaporate more easily so you can feel cooler and less moist.
Ventilated Mesh Yoke
We appreciated the ventilation on the back and the curved mesh yoke while backpacking in Mojave Desert National Monument. Photo by Kate Hoch.
The yoke is where the two shoulder straps meet at the back of your pack.
The mesh yoke keeps the back of your pack up to 3 inches off the middle of your back, allowing airflow and keeping your body cooler. Osprey patented this technology and we haven't seen anything quite like it on any other pack we tested. The result is that in testing in deserts, on big climbs, and in summer heat, we noticeably felt cooler wearing this pack.
Weight
The Osprey Eja Pro pack on the Trans Catalina Trail. Photo by Kate Hoch.
The men's pack weighs 2.1 - 2.2 lbs, and the women's pack is 1.9 - 2.1 lbs. By removing the lid, you can save 2.8 oz.
For lightweight packs, we think 2 lbs is the target mark for weight, so this fits right in line with what we'd want to see of a pack in its class. That's one reason we prefer the Osprey Exos Pro and Osprey Eja Pro line compared to the traditional Exos and Eja line.
While the old school Exos and Eja line are Osprey's lightest offerings, they still fall short of what we'd want to see for a lightweight pack weighing almost a pound more than the Pro series. With the Pro series, Osprey has made a pack competitive with lightweight packs made by cottage brands, lite Hyperlite and LiteAF (read our review of one of our favorite LiteAF packs, that has a similar weight and capacity to the Pro series).
Volume and Capacity
The Osprey Eja Pro pack had enough capacity for a winter thru-hike of the Trans Catalina Trail. Photo by Kate Hoch.
The Exos Pro and Eja Pro differ slightly in capacity depending on what size torso you have. Backpackers who have a sub-20" torso should opt for a men's S/M, which has a 55L capacity. The men's M/L has a 58L capacity. The women's versions are also 55L capacity.
We take stated capacity with a grain of salt. See our How accurate are manufacturer stated volumes article and video for more information.
Still, we think the Exos and Eja are exactly the capacity you'd want for most lightweight backpacking trips. Unlike other packs that feel more like a 70L pack that is given the label of 55L, this feels true to claim.
The Osprey Exos Pro and Eja Pro pack have straps to compress your pack so it can be used without the lid. Photo by Liz Thomas.
For a lighter weight pack, you can easily remove the top lid. This reduces the capacity by about 3L, but saves almost 3 oz. Many ultralight hikers opt to do this and instead carry a hiking fanny pack, which weighs less than the lid and can be used as a standalone bag in town, for peak bagging, as well as while wearing the pack.
Carrying capacity
Comparing the Osprey Aether (left) with the Osprey Eja Pro (left) on a backpacking trip on the California Riding and Hiking Trail in Anza Borrego Desert. Photo by Kate Hoch.
The Osprey Exos Pro and Eja Pro have a carrying capacity of up to 40 lbs with the comfort max being around 30 lbs. This is in line with other lightweight backpacks we tested.
However, this carrying capacity is significantly less than other Osprey backpacks. If you're used to carrying a traditional Osprey backpack, know that you won't be able to stuff the same gear in here that you would with your Osprey Aether or Aura.
Be mindful of this as you put together your backpacking kit. Choose lightweight and ultralight gear as if you were carrying a minimalist backpack.
Remember: this looks like other Osprey packs and is quite comfortable with the proper load–however, you shouldn't push it.
Eva Foam Padded Hip Belt
Close-up on the generous hipbelt pockets on the Osprey Eja Pro on a backpacking trip in the Eastern Sierra near Yosemite National Park. Photo by Liz Thomas.
The hipbelt is lightweight but well-padded. One side of the hipbelt has a generous zippered pocket and the other side has an elasticized open pocket.
We've had this gripe with other packs, too, but elasticized pockets just seem like an equation for energy bars falling out.
Still, many folks find it easier to stash stuff in pockets without zippers, so we get that it is a personal preference. We were also pleased to find the zippered pocket fits our standard iPhone 14 with no issue.
Hydration sleeve
Using a hydration hose connected to a bladder inside of the Osprey Eja Pro. Photo by Liz Thomas.
The Exos and Eja has one of the most generous sewn-in hydration sleeves we saw on a pack. We also used it to keep other items secure like our wallet, keys, and passport that we don't need to access everyday but do need to carry.
Built-in hydration sleeves are rare on lightweight packs. Many brands make you pay extra. For those who don't use hydration sleeves, you can cut it out of the pack to save even more weight.
2 Ice Axe Loops
We think this is essential for all backpacking backpacks, even minimalist ones, and were pleased that there are two, giving you options for which side of the pack to carry your axe.
Multiple Lash Points
This made it easier to attach items like our sleeping pad.
Deep side pockets
Close-up on the tall mesh side pockets on the Osprey Eja Pro pack, which are holding a pair of hiking poles and tent poles on this backpacking trip in the San Gabriel National Monument. Photo by Liz Thomas.
The Osprey Exos Pro/Eja Pro have deep side pockets, both with dual access. Having the top so high up means you can really store a lot of gear in these pockets.
The design is a double-edge sword, though. It gives you more volume at the expense of access from the top. To compensate for this, the pack has dual access from the bottom. This means you can still reach your Smartwater water bottle from the mid-to-bottom side, even though the top is so high up that you wouldn't be able to reach it.
We recommend storing larger items in these pockets. The dual access bottom means smaller items, like headlamps and trash, could fall through. Instead, we found this an ideal place for storing layers we've removed (or anticipate needing later in the day, like a rain jacket). We also stored our backpacking stove and cookpot in these pockets.
Compression straps
Close-up on the strap system on the Osprey Eja Pro pack. Photo by Liz Thomas.
You can adjust the width of your pack depending on how much stuff you're carrying. The Osprey Exos/Eja has more compression straps than most ultralight packs, especially those made by cottage brands. It makes it look aesthetically less sleek and more like a traditional backpack. If this bothers you, we recommend removing them (but remember, it may void your warranty).
PFAS-Free DWR
Our thru-hike of the Trans Catalina Trail with the Osprey Eja Pro pack was during a rain storm where the Durable Water Resistant (DWR) was appreciated. Photo by Kate Hoch.
We appreciate that Osprey is taking the lead on using DWR (Durable Water Resistant) coating that is free of PFAS and PFC, so-called "forever chemicals" common in waterproofing. Read more about PFAS and PFCs in outdoor gear and why states are banning it.
Sizing
We found the back of the frame on the Osprey Eja Pro pack comes slightly above the shoulders. Photo by Kate Hoch.
We found the frame to run tall. It rides higher up than other packs. Our testers found that their movement was restricted when moving their head backwards to look up. Some testers found that sun hats with wide 360-degree brims were impeded by the height of the frame. This was true for testers of different heights and torso lengths.
Still, we thought it was just us. We thought maybe we had sized the pack incorrectly. But then we read that the testers over at Adventure Alan and had a similar experience.
We got used to it, but if you think this would be a dealbreaker for you, we recommend choosing a different pack.
Front pocket
Close-up on the outside pocket on the Osprey Eja Pro pack, which uses less mesh and more fabric than other packs we considered. Photo by Kate Hoch.
The one design issue we had with the Pro series is that the front outside pocket doesn't have as much mesh as other packs, and doesn’t stretch as much as a result. This makes it difficult to cram much in there. Less mesh also means it is harder to dry out wet gear, like socks or a tent, on the outside of your pack.
Similar Backpacking Backpacks
ZPACKS ARC HAUL 60
Capacity: 60 L
Weight: 1.4 lbs
Max load: 40 lbs
Cost: $400
The Zpacks Arc Haul 60 is an ultralight backpack with a 60L capacity and a frame that keeps the air off your back to increase airflow. Like the Exos Pro and Eja Pro, it excels at ventilation. The big difference between the Exos Pro and Eja Pro is in weight and price.
The ArcHaul weighs 21 oz, which is significantly lighter than the Exos Pro and Eja Pro. It's also made of Ultra 200 or Robic, which are more durable and technical fabrics that are also expensive. Due to the weight difference between the two packs, the carry and comfort feels different.
Due to these fabrics and the fact it is made in the USA, the Zpacks Arc Haul 60 costs significantly more than the Osprey Exos Pro and Eja Pro. Additionally, features like hip belt pockets, shoulder strap pockets, and an internal hydration sleeve are not included on the Arc Haul, so you'll have to budget even more. Still, we think it's a great pack if price is less of a concern for you.
View the ZPACKS ARC HAUL 60
Capacity: 60 L
Weight: 2.0 lbs
Cost: $315
Max load: 35 lbs
The Gossamer Gear Mariposa is an ultralight backpack with 60 L of capacity (36 L in the main body). The main body is 100D Robic, a fabric similar to the Osprey Exos Pro and Eja Pro. The large size weighs 34 oz and costs $285, so it is pretty comparable to the Exos Pro and Eja Pro in weight and price. Pockets in the shoulder straps add an extra cost. You can read our full review of the Gossamer Gear Mariposa in our long-term review.
Compare prices of the Gossamer Gear Mariposa
Capacity: 40 L, 55 L
Weight: White: 1.9 lbs., Black: 2 lbs. (for the 55 L)
Max load: 40 lbs.
Cost: $379
The Hyperlite Mountain Gear Southwest 55 is an ultralight backpack with a 55L capacity that is similarly popular to the Osprey Exos Pro and Eja Pro on long distance hiking trail.
This HMG pack is constructed of Dyneema Composite Hybrid fabric. The white fabric has 50-denier Dyneema and weighs 31.7 oz. The black version of the 55L is constructed of the much more durable 150D Dyneema. The black 55L weighs 34.6 oz.
DCH fabric is more expensive than the fabric used on the Osprey Exos Pro and Eja Pro packs. As a result, no matter what color you choose of the Southwest 55, it's going to cost about $100. Pockets on the shoulder straps cost extra.
And of course, we can’t leave without mentioning one of our other favorite Dyneema HMC packs, the Junction (check out our full review).
Compare prices of the HYPERLITE SOUTHWEST 55
Granite Gear Crown3 60
Capacity: 60 L
Weight: 2.4 lbs (men’s), 2.36 lbs (women’s)
Cost: $240
Max load: 35 lbs
The Granite Gear Crown3 60 is our budget winner in our Best Lightweight Backpacking Backpacks guide. It's similar to the Osprey Exos Pro and Eja Pro but costs a lot less.
You'll find similar features like generous side pockets, compression straps, and a removable top lid. The Crown3 60 also has some things we like better than the Eja Pro and Exos Pro, including a more durable fabric and the mesh on the pockets is stretchier. The padding on the Crown3 60's hipbelt and shoulder straps is more comfortable, too.
However, the Crown3 60 doesn't have the same airflow as the Exos Pro and Eja Pro. So if that is a dealbreaker for you, go with the Osprey.
But if you're looking to get into lightweight backpacking and airflow isn't as important, we think the Crown3 60 is a solid choice and great value. It doesn't require a huge investment and will grow with you as you lighten your load.
Compare prices of the Granite Gear Crown3 60
Men's
Women's
Should I buy the Osprey Exos Pro or Osprey Exos Eja Pack?
Yes! If you've had good luck with Osprey packs in the past but want something lighter, the Exos Pro and Eja Pro will be everything you want and more.
It's as lightweight as other packs made by cottage brands, well-ventilated, with the suspension and comfort that Osprey is known for. Compared to packs with similar features and a similar weight, it is a relatively good deal, too.
Why you should trust us
Mike Unger is a Double Triple Crowner — he has hiked the Appalachian Trail, Pacific Crest Trail, and Continental Divide Trail not once, but twice (he's actually hiked the PCT three times, the most recent being a southbound thru-hike).
In addition, he has backpacked numerous other on-trail and off-trail routes, including the Pacific Northwest Trail, Blue Mountains Trail, Great Divide Trail, Arizona Trail, Ouachita Trail, Oregon Desert Trail, Grand Enchantment Trail, and Mogollon Rim Trail. Over the course of his backpacking, he’s purchased and owned an embarrassingly-large number of backpacks.
Mike has tracked and researched pack technology for the past 20 years. He's notoriously extremely hard on his gear, which makes for a good gear tester.
Mike Unger is not and has never been a sponsored athlete, ambassador, or influencer for a backpack company.
You can read all of Mike's stories on his author page.
This piece was edited and testing notes supplemented by Liz Thomas. You can read all her articles on her author page.
