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The supremely ventilated, featured and durable Stratos Series receives a makeover that is more than skin deep for Spring 2017. Now featuring adjustable torso lengthsfor improved fit and comfort with updated aesthetics, the Stratos 36 is the go-to choice for everything from short day hikes to lightweight overnights in the backcountry no matter how far, or near. When the weather turns, fear not - Stratos keeps your gear and pack protected with an integrated raincover. Smartly organized pocketing keeps all your equipment where you need it, when you need.

Key Attributes


Incredibly comfortable and ventilated tensioned mesh backpanel with added adjustability for variations in torso length to provide fine-tuned customization fit for every hiker and backpacker.


Users can't feel seams that don't exist, and because there aren't any on the Stratos/Sirrus updated hipbelt, hikers can focus on the journey instead of the pack on your back.


Hope for bluebird weather but know you're covered with our integrated and removable raincover that stows in its own pocket when the sun returns.

Additional Features

  • Dual side compression straps
  • Stow-on-the-Go™ trekking pole attachment
  • Ice tool loop with bungee tie-off
  • Internal hydration reservoir sleeve
  • Fixed top-lid with zippered slash pocket
  • Front panel vertical center zippered pocket

Carry Information

Spacer Mesh Sewn-in Hipbelt

  • Zippered stretch mesh hipbelt pockets
  • ErgoPull™ hipbelt closure with hipbelts directly connected to backpanel mesh
  • Seemless lumbar to hipbelt body wrap

Airspeed™ Suspension Backpanel

  • LightWire™ alloy frame creates low profile air space optimizing pack balance and ventilation
  • 3D tensioned breathable mesh backpanel ensures supportive fit

Spacer Mesh Harness

  • Sewn-in spacer mesh
  • Adjustable sternum strap with safety whistle
  • Mesh covered ventilated die cut foam
  • Multiple torso size options with torso adjustability


Load Range
15 - 35 lbs.
7 - 18 kg
  Volume Dimensions Weight
S/M 2014 in3 / 33 l 25.2h x 13w x 12.6d in. 3.174 lbs.
M/L 2197 in3 / 36 l 27.2h x 13w x 12.6d in. 3.296 lbs.
S/M 2014 in3 / 33 l 64h x 33w x 32d cm 1.44 kg
M/L 2197 in3 / 36 l 69h x 33w x 32d cm 1.495 kg
210D Nylon Crosshatch
420HD Nylon Packcloth
420HD Nylon Packcloth



Front panel storage pocket


Top-loading access to main compartment


Integrated raincover


Side panel zip access to main compartment


Under top-lid zippered mesh pocket


Dual side stretch mesh pockets


Zippered hipbelt pockets


Zippered sleeping bag compartment with bellowed divider


Removable sleeping pad straps

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So close to perfect...


When I was looking for a pack, I knew I wanted a multi-purpose bag that would work for unpredictable day hikes, travel, and longer, lightweight overnighters. This pack fits each of these categories so well: the body cinches down on day hikes and doesn't flop around, fits easily in a (larger) overhead bin on a plane, and have used during warm overnight backpacking trips. It's not the lightest pack around, but what you get in return in hearty fabric. This pack is tough. Had to bushwhack through a section of trail and barely a scratch was left on the pack, save for a snag on the water bottle holders. The integrated raincover is great (and removable!) and fits over this pack and over any gear you might have stowed externally. I've carried around 30lbs comfortably, and the suspension keeps everything nice and centered over my hips. This is a great pack. However, there are two things that would take this pack to a perfect 5-star to me. 1) Larger water bottle pockets and 2) a stretch mesh external pocket. I can barely fit a standard nalgene in the side pockets, the elastic up top is cinched almost flush with the pack and does not expand much at all. I use these primarily now for tent poles and maybe a slim water bottle. This would be such an easy fix. And another easy fix would be to remove the silly front zipper. This compartment does not get much use from me, besides holding a map. The zipper is chunky, the fabric seems chunkier here as well, and the center position makes putting anything else inside a chore. Unlike many of their other popular packs (the Exos and Atmos come to mind) that have this FANTASTIC strechy mesh that doubles as a perfect stash pocket surrounding the front, this pack lacks it. With this fix, a puffy, hat and gloves, and rain jacket are immediately removed from the main compartment to the outside, making this a serviceable long-distance pack.



A great, great pack ...


I just wrapped up a long walk from Barcelona, Spain to the start point of the Camino de Santiago in France. There's enough to worry about on such a trek and prior experience has taught me that if you're thinking about your pack, you have the wrong pack. Not once did I ever second guess, fret and wonder about the Stratos 36. It rode like a dream. As with my other Ospreys, it's built well and held up without a single issue. But the on-trail vote seemed to favor Ospreys, too: my guess is at least half of all hikers shouldered an Osprey. That's probably all you need to know.

Charlotte, NC


Great pack, carries a lot of camera gear


I bought the Stratos 36 to replace a well-worn and retired 1st generation Exos 34. Like my old Exos this pack is a tad oversized for most of my gallivants. However, the extra room is perfect when I'm carrying camera gear (extra lenses, tripod, etc.) or I'm hiking to a remote location for a day of fly fishing. The suspension handles the occasional 25-pound load just fine. Note: I just returned from a guided day-hiking tour of Glacier National Park. We had three guides and 25 clients. Osprey packs abounded in the group. One of the guides, the only woman, was carrying a Sirrus 36. Over half of the clients were carrying various Osprey day packs.

Wasatch Front, Utah


Just what I was looking for


I was looking for a pack that I could use for long day hikes or an over night campout. This pack holds everything I need for either. Have not used overnight but so far so good on training hikes. Looking forward to using this pack for many years. I also own the Talon 22. Love that one as well. I have used it for several years on many hikes without a complaint. Just needed something a little larger for extended trips.



Perfect pack for day hikes and winter activities


My 20 years-old 42 litres Lafuma finally died completely and it needed a replacement as I now had a large gap in my pack stable: I have a 14 L Osprey Raptor for mountain biking and light summer hikes, then an Arc Teryx Bora 60 and 80L. I did not want to buy other dedicated packs (i.e. a light one for summer, and an alpine type pack for winter), so I wanted one that could do it all, and I had a lot of requirements: enough attachments to carry xc skis, snowshoes, and Microspikes, between 35 and 42 L to carry enough warm layers and food for day winter outings, have a ventilated mesh back for summer hikes, be very lightweight, be compatible with hydration bladders, sturdy and comfortable hip belts with large pockets for snacks and cell phone, sturdy pack material, side or bottom access (my old one was only top load and I kept having to search for everything). have a rain cover or be water resistant, have some way of attaching trekking poles... I was headed to a weekend in the Adirondaks and put all my gear in my Bora60 as I did not have a day pack. I stopped on the way to the mountains and picked the Statos and I am so glad I did: it ticked all the boxes and with all the same gear in it, it really felt like the weight dropped by 30-50% (to be fair the bora 60 is a heavier pack)! The trekking pole stow and go is really handy and works well. There are a bunch of small details that are great about this pack - key clip holders inside the top part are easy to use, there are holes in the side pockets to have the compression straps run inside or outside of the pocket. IMPROVEMENTS: It would be nice if the pack came with a magnet to attach the hose from an Osprey hydration bladder. I have only used the pack for 3 days and I can see that everything white will be an ugly and dirty brownish color in a few years; grey would have been more practical. I would have liked the bottom compression straps to clip instead of being inserts.

Ottawa, ON


Oh what is this perfect little thing?


I've never been more excited. It is like this new bag was custom built for my happiness. Can't wait to see just how perfect it really is.




4.8 6


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