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Osprey Stratos 50 Internal Frame Backpack

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Osprey Stratos 50 Internal Frame Backpack

By Josh

Enwild Gear Specialist

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Weighing just over 3.5 pounds while comfortably carrying up to 40 pounds the Osprey Stratos 50 pack has delivers technical performance for overnight and weekend backpacking trips.


Weighing just over 3.5 pounds while comfortably carrying up to 40 pounds the Osprey Stratos 50 pack has delivers technical performance for overnight and weekend backpacking trips.

Employing Osprey's Airspeed Suspension the pack’s tensioned mesh back panel provides flexible support and breathability to combat heat build-up between your back and the pack body. Both the hipbelt and harness straps are padded with die-cut foam and covered in mesh to enhance comfort and optimize fit. Accommodating backpackers of varying size the Stratos 50 is available in Small/Medium (fits torso lengths ranging from 16”-20”) and Medium/Large (19”-23”) size options. Adjustability in the harness load-lifter straps and sternum strap enhance fit.

The storage capacity of the Small/Medium pack is 2868 cubic inches and the Medium/Large has a 3051 cubic inch capacity. In addition to its traditional top access point the main packbag can be reached through a zippered side panel entry. Additionally a lower compartment serves as a dedicated spot for stowing your sleeping bag or other clothes and gear. A front stretch shove-it pocket with two vertical zippered stash pockets two side stretch pockets and dual pockets on the pack’s lid offer additional organizational options. To save weight you can remove the lid entirely.

Other features include a Stow-on-the-Go trekking pole attachment removable sleeping pad straps an ice axe attachment with a stowable bungee tie-off and an integrated rain cover. A lined internal sleeve and drinking tube pass-throughs make the pack hydration compatible (hydration system sold separately).

The Osprey Stratos 50 internal frame backpack is available in your choice of size and color options.

  • Dual side compression straps
  • Stow-on-the-Go trekking pole attachment
  • Dual side stretch mesh pockets
  • Front panel storage pocket
  • Ice tool loop with bungee tie-off
  • Integrated raincover
  • Zippered hipbelt pockets
  • Internal hydration reservoir sleeve
  • Top loader access to main compartment
  • Removable top-lid with zippered stash pocket
  • Under top-lid zippered mesh pocket
  • Side panel zip access to main compartment
  • Front panel pleated fabric shove-it pocket
  • Dual vertical zippered stash pocket on front panel shove-it
  • Zippered sleeping bag compartment with bellowed divider
  • Removable sleeping pad straps
California residents: view proposition 65  Warning

Technical Specs

Best Use
Backpacking, Hiking
Top Loading w/ Side Access and Sleeping Bag Compartment
Item Dimensions
28" x 14" x 15"
Fits Torso
Small/Medium: 16"-20"
Medium/Large: 19"-23"
Frame Material
Hydration Compatible
Maximum Weight
40 lbs
Sternum Strap
Yes; Adjustable
Torso Adjustment
Small/Medium: 2868 cu in
Medium/Large: 3051 cu in
Limited Lifetime
Internal Frame Backpack
Main: 210D Nylon Crosshatch
Accent: 420HD Nylon Packcloth
Bottom: 420HD Nylon Packcloth
Item Weight
Small/Medium: 3.56 lbs
Medium/Large: 3.68 lbs

12 Reviews

4.67 / 5

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Jeremy O.


Not bad


This is an okay pack. But step up to the Atmos.


Doesn’t transfer the weight very well. Sleeping bag compartment divider isn’t removable. Lower side compression straps run over water bottle pockets. Buy the Atmos

Adrian B.


Decent weight pack with limited volume


Great color, holster style water bottle pockets, comfortable suspended mesh suspension.


Compression straps go right across water bottle pockets limiting use. Small sleeping bag compartment without a removable divider. Not a true 50L pack. Smaller capacity than my 40 liter pack.

Jeremy R.


Great quality that osprey is known for. Many great feature...highly recommmend


High quality materials Attention to detail Very comfortable fit



Rick W.


Great size and weight for lightweight hiking. A great upgrade from the Talon sizes with the same internal frame set and bladder sleeve.


Very lightweight Padded straps Raincover


?? It is Osprey, what is to dislike? They have done their homework and given you exactly what you needed.

Paul B.


Excellent All Purpose Pack


Lots of room to store all your gear. Easily will handle enough gear for a multi-day hike and then some, unless you have super bulky gear. Tool loop on the back plus on the front is a nice tough for trekking pole storage and if you take an axe (like me). Suspension system really spreads the weight all throughout your back. Also while the sleeping bag compartment is sealed in, there are two toggles you can remove to make the main compartment the whole pack.


The sleeping bag compartment is rather small; I had trouble getting my sleeping bag in when I had zero trouble in another 48L bag. Also, the lack of a lower lumbar pad doesn't really work for me; I have more curve in my back than probably most, so I prefer the lumbar support. The material for the shoulder straps also dug into my shoulders, but this wouldn't be an issue if you keep the load light or are winter camping and have multiple layers on.

Robert S.


Above-Average Day Pack, Too.


Suspension. Relatively light weight. Adjustable brain. Love the Stratos 36 but sometimes it's not big enough for some extra Rocky Mountain clothing...even for a day hike....and required bear canister for an overnighter. Adjustable lid makes both scenarios easier. Considered the Kestrel 48 but stuck with the suspension I was used to. Very comfy for light to mid loads.


Hip belt was shorter compared to the Stratos 36. Harder to get a good grasp.

Marc M.




I went back and forth for a while trying to decide between the Stratos 50 or Kestrel 48. Both checked all the boxes on my wish list and a few other features that may come in handy. In the end, I chose the Stratos for the suspension. I liked the idea of the air space between the pack and my body, plus the padding just felt better. Big thanks to Backcountry Edge for the YouTube vids detailing both packs...a huge help!


Wish hip belt pockets we're bigger. The frame does seem to squeak a bit as other online reviews suggest. My pack really needs to twist to hear it. Hopefully once I get a few long hikes with some decent weight packed in, it will break in and go away. It's not annoying enough to bother me a lot right now so no real worries.



A pack well-equipped


Def. durable and functional. Has most things one would look for.


As the cap bag is detachable, a built in flip cover to cover top should be included; other iterations of Osprey do just that.

Brenton B.


Excellent pack for it's size


Perfect fit without a lot of adjustments. Carried 30 pounds on first trip with no problems


none so far

Chris K.


Great Pack


Fits great, comfortable and durable. 50 liters works perfect for my weekend trips.



John R.


Looks great, feels great


The new styling looks very clean. It's sleak and isn't flashy, which is the styling I prefer with my camping/hiking gear.


I still prefer the atmos

Paul V.


A Snazzy Backpacking Buddy!


An extremely comfortable and durable pack. The ventilation system looks like it should hold up well over time. I can my gear in the pack well, and not all of my equipment would be meet that vague standard of "ultralight." The frame also does a top-notch job of transferring weight to my hips.


Haven't found any so far. If someone can find a way to maintain all the features while making it a little lighter, well, I'd probably buy him or her a beer!