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  • Updated materials and hardware provide a lighter weight pack than the previous version; the lid, key straps and attachment points are all removable
  • Superlight Airspeed™ suspension features a 6065 aluminum frame and breathable 3D tensioned-mesh back panel with side ventilation
  • ExoForm™ shoulder straps include a stretch-mesh energy gel pocket and a 15mm adjustable slide sternum strap with a built-in whistle
  • ExoForm hipbelt features an ergonomic, forward-pull cinch closure that lets you get just the right fit; seamless layered mesh provides comfort and cushioning
  • Removable floating lid includes top and under-lid zippered pockets for stashing trail essentials within easy reach
  • FlapJacket™ lid deploys to provide main compartment protection from the elements and top-down compression to keep the pack load stable
  • Hydration-compatible design places the reservoir (sold separately) in a cavity behind the back panel for easy refilling
  • Ultralight, 7mm webbing compression straps on the sides take up extra volume with minimal added weight; route the straps over or under the side pockets
  • Sleeping-pad straps and a single tool attachment with bungee tie-off let you strap extra gear to the outside of the pack
  • Front and side stretch woven pockets provide handy spots for stuffing a rain jacket or water bottle; zippered hipbelt pockets give you a place to stash energy food
  • The Osprey Exos 38 Pack is made with 100-denier nylon and ripstop nylon for ultralight durability


View all Osprey Backpacking Packs

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Best Use Backpacking
Frame Type Internal Frame
Ultralight Yes
Gear Capacity (L)
Gear Capacity (cu. in.)
2 lbs. 1 oz.
2 lbs. 2 oz.
2 lbs. 3 oz.
Weight - Metric
0.93 kilograms
0.97 kilograms
1.01 kilograms
Fits Torso
16 - 19 inches
18 - 21 inches
20 - 23 inches
Fits Waist/Hips
24 - 45 inches
27 - 48 inches
29 - 55 inches
Material(s) Ripstop nylon
Frame Material Aluminum
Number of Stays 1
Suspended Mesh Back Panel Yes
Pack Access Top
Number of Exterior Pockets 4 + main compartment
Gender Unisex
Rated 5 out of 5 by from Love these packs! After months of searching for a good pack for day hikes up 14ers I finally choose the Exos 38. One of the best packs I've ever owned. The removable top compartment isn't a feature I'll ever use so the extra material that serves as the secondary top cover is a slight annoyance. The top compartment also doesn't sit very well if the pack isn't fully loaded up. And other than the lack of color options(wishing there was a dark grey/burnt orange, but I'm nitpicking) this pack is solid. I've used the 38 and 58 on multiple 12+ mile hikes and never had any problems. Still amazed that it's as light as it is for what it can carry. I used to be a devoted Black Diamond pack user. Osprey has pretty much won me over with the Exos.
Date published: 2016-08-01
Rated 5 out of 5 by from The best lightweight/ultralight pack ever! I've hiked with everything from 6lb. 70 liter packs, to 1 pound ultralight packs... and this pack is hands down the best solution for any back country trip. One caveat... you'll need smaller gear to fit it into the 38 liter. I'm able to fit: 20 degree down bag, full size blow up pad, small tent (flycreek UL2) with poles, nalgeen sized cook kit, all my 3 season clothes, extras bag, 5 days worth of (light weight) food, and 2 - 1 liter water bottles with sawer mini filter. Without even putting the detachable top lid on! This comes with a second top flap. So... if I need a few more days of food, or more winter clothing etc... I still have room. This pack cinches down perfectly, it creates a space between your back and the pack with the special mesh and aluminum frame suspension system. It comes in at a few ounces over 2 pounds. This is the best solution for any backpacker with 11-20 pound base weight. Bring your gear to REI to make sure it all fits first, and also have them measure you for the correct size. Once you get it home, don't be afraid to load it up and then bend the internal frame bars to closer match the contours of your back. Call REI first because they routinely sell out of this pack. I will end with: Osprey is a name you can trust, the web is littered with positive reviews on this company, how they treat their customers, and the quality of their products.
Date published: 2014-10-20
Rated 5 out of 5 by from Love it! I haven't yet had a chance to log very many miles with this pack but so far it's a real winner! So small, light, and maneuverable. Practically clings to my body (in a good way), while maintaining great airflow between my back and the pack. Be aware that the sleeping pad straps are on the bottom of the pack, so if you're slightly goofy like me and carrying a luxurious, heavy camp bed strapped to an ultralight kit the sleeping pad placement prevents you from using Osprey's hiking-pole stow-n-go loops. Not a dealbreaker for me, but it's good to know.
Date published: 2016-11-07
Rated 4 out of 5 by from Osprey Exos 38L Pack After lots of on-line research, I narrowed my choice down to four 40 liter packs, all offered by REI. I was looking for a pack that could be used for long day hikes and ultimately a trek on the Camino de Santiago in Spain next year. All offered the features I wanted, but this pack had the best feature/weight combination. Features I like are the vented suspension and hip/shoulder straps, the various pockets and compression options, the removable top hood, and the treking pole holders.But the decider for me was comfort. This pack was by far the most comfortable for my torso size/shape. I've only used the pack on a few training hikes with 15 to 20 lb loads( my target pack weight for the Camino), and so far have been impressed with it's fit and ride, I hardly know it's there. The only reservation for me is durability( hence the 4 stars), and time and use will tell. It is so light weight that I hope it holds up, no reason yet not to think so. Also, kudo's to the REI staff at the Cincinnati store. They fit me with all 4 candidate packs, customized them to my torso, loaded them up with 20 lbs of weight and let me walk around the store for an hour while I tried them all out. On-line they all looked similar, but until you put them on and load them up, you don't realize how different they can fit and feel.
Date published: 2014-08-15
Rated 5 out of 5 by from Great Pack. Hope it's not too small. I had an Exped Mountain Lite 40 prior to this one. I liked the Exped, but it didn't have any pockets, it didn't have a mesh back pad so I would sweat a lot when backpacking. This is nearly the same size and solved those issues. 3 nice sized pockets. The back pocket is massive. The mesh back support is just amazing especially if you are in warmer weather. It's great support and it keeps the pack a good 2 inches from your back with plenty of air flow. There are also small pockets in the hip belts and the shoulder straps. The brain is removable as well which is a nice feature if you don't need the extra space. I have a quite small load both in volume and weight by now, so I gave up some of that weight for the luxury of this pack. At just over 2 pounds it's certainly not heavy, but it also has the mesh back and pockets lacking in other lighter packs. Overall this is an amazing purchase and even at 38 liters I can still fit all my gear and a good 7 days of food + 3 liters of water all under 25 or so pounds.
Date published: 2016-01-03
Rated 5 out of 5 by from Osprey Exos 38 I love this backpack. I have taken it from Greece to Africa to National Parks around the United States and it has never let me down. At 38 liters I expected it to be a little big for day hiking and a little small for backpacking. I HATE packs that flop around like a wet noodle when not full but the Exos has great compression straps on the side and you can take the top pocket off which eliminates "too big" problem. I am a large guy who likes to eat well in the backcountry so even though my gear would be minimalist if I was 5'7" I was worried about it fitting into this pack. Every time I go backpacking for less than a week now I use my Exos. I am somehow always surprised at how much can fit into this pack if you use it properly. I fit: extra long 15 degree sleeping bag, long (they don't make extra long) sleeping pad, jetboil group cooking set (size of a regular small pot), marmot limelight 3 tent (poles on the outside), sawyer mini water filter + 2 empty platypus soft bottles, 3 season of clothes, 4 days worth of food, my dslr camera, and essentials like my knife, matches, pills, etc. Overall, incredible pack that is super comfortable and can handle all types of duties. Some places where I would score the Exos negatively: -The mesh of the outer and side pockets is super stretch and soft but rips easily. - the back panel is curved so if you put a flat water bladder in, it takes up an absurd amount of room on the inside. I had to solve this my packing the platypus soft bottles that can roll up when not full and screw on to the sawyer filter. -After over a year of constant hard use in mostly hot and humid conditions the material is kind of sticky and the zippers are also sticky.
Date published: 2016-04-12
Rated 5 out of 5 by from Remarkable Pack For background, I've been backpacking since the 1970's, and as technology progressed, I gradually learned to appreciate ultra-light backpacking. I would never have imagined using such a pack on a long distance hike in the past, but not anymore. It's a great day pack for heavier loads, but it is also capable of handling a long haul. I completed an AT thru hike in the past, with a larger, heavier pack. If I were to attempt another thru hike I would probably carry my Exos 38. By the time I completed my hike I was down to a total weight (including food+water) of about 27 pounds for 3-4 days between food resupply. I've carried 27 pounds repeatedly with the Exos 38 and it does just fine. I've seen a few reviews claiming that the Exos shouldn't be used for weights above 20 pounds or so. I'm just not experiencing that. I feel great with the Exos 38 at 27 lbs., even with nothing on underneath but running shorts and a running shirt. The shoulder strap and hip belt padding are fine for me. It has the same eternal frame suspension of the larger packs in the Exos series (48 and 58), so it can certainly handle the weight. With a full load of food I put my tent underneath. When my food bag nears empty the tent goes inside. While not large enough for colder weather overnight use when I pack more clothing and a warmer sleeping bag, it's plenty big enough for summer and shoulder season overnight use. That's dependent on where you are hiking of course. While the hip belt pockets could be larger, the roomy "brain" makes up for that. I can hike all day not having to access the main compartment. I don't have enough time with this pack to judge the long-term durability of the stretch mesh pockets (sides and back). I'm guessing they would be pretty chewed up after a few thousand miles, but so was the mesh on my Circuit.
Date published: 2016-11-14
Rated 5 out of 5 by from Large daypack / UL overnite pack After 15 years with a previous daypack, it was finally time to replace it. Although 38L is big for a summer daypack, it is great for cold weather trips. And to my surprise, I found out I can fit my summer UL overnight gear and food in this perfectly. The pack "rides" nice and comfortable. It has a sternum strap but I prefer not to use it, so I cut it off already. Very pleased with this product.
Date published: 2016-08-14
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Does anyone know whether or not I can use it as a carry-on when flying? Thanks.

Asked by: Hiker2016
The dimensions for the Exos 38 Pack are 30 (H) x 13 (W) x 11 (D) inches. Most airlines require carry-on items not to exceed 45 linear inches (L + W + H). The Exos 38 measures at 54 linear inches and will be too big for a carry-on. We would highly recommend checking with your airline prior to your trip.
Answered by: REIservice
Date published: 2017-04-20

Is it possible to attach a rolled matress, like a regular riddgerest, with the bottom straps? Thanks

Asked by: Vicvic
​Yes, the Exos has a multi-use pad strap located near the bottom of the pack for carrying a pad or other gear.
Answered by: REIservice
Date published: 2016-12-27

Does it have bedroll straps on the bottom? And if so, would attaching a small solo tent to the bottom have any negative effects?

Asked by: yosoytrey
You could lash a small backpacking tent to the bottom of the pack using the straps on the bottom. Lashing a tent to the bottom saves room inside the pack.
Answered by: REIservice
Date published: 2017-01-24

will a BV500 fit horizontally like it will in the 58?

Asked by: PCTHikerSean
​The BV500 cannot fit horizontally inside of this pack.
Answered by: REIservice
Date published: 2017-01-31

Is this a unisex backpack or is there one with the same features and weight for a female?

Asked by: VTX88
This pack is unisex. There is not a women's specific version available.
Answered by: REIservice
Date published: 2017-04-26

I went hiking recently in the Everglades and stayed one night in a primitive site. I could not figure out the best was to lash my sleeping bag - had to use bungie cords. The straps at the bottom of the bag were too small to fit my bag. Suggestions? 

Asked by: Charles Boisseau
You might try putting your sleeping bag inside of a compression sack and then trying to lash the sleeping bag to the outside of your pack. Compression sacks will reduce the overall pack size of the sleeping bag.
Answered by: REIservice
Date published: 2017-04-14

Can this fit as a carry on for a plane?

Asked by: RichKann
According to Osprey, Exos 38 Packs have the following dimensions: small 26x13x11 inches; medium 28x13x11 inches; large 30x13x11 inches. All of the Exos 38 Pack sizes are too large to qualify as carry-on luggage when filled. As a general rule, airlines limit the size of carry-on luggage to 45 linear inches, the combination of length, width, and height in inches. For example, a bag that is no larger than 22x14x9 inches is usually okay. It is recommended that you check with your airline to confirm their size limitations for luggage.
Answered by: REIservice
Date published: 2017-01-24

What is the pack weight with the lid removed?

Asked by: gbiologist
​The pack weighs approximately 1.9 lbs. without the lid.
Answered by: REIservice
Date published: 2017-05-27
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