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Osprey Sirrus 50 Women's Internal Frame Backpack

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Osprey Sirrus 50 Women's Internal Frame Backpack

By Becky

Enwild Gear Specialist

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Weighing roughly 3.5 pounds while comfortably carrying up to 40 pounds the Osprey Sirrus 50 Women’s pack has delivers technical performance for overnight and weekend backpacking trips.


Weighing roughly 3.5 pounds while comfortably carrying up to 40 pounds the Osprey Sirrus 50 Women’s pack has delivers technical performance for overnight and weekend backpacking trips.

Committed to providing all outdoor enthusiasts with optimal performance Osprey equips its women's packs with gender-specific design features. Harnesses are cut wider through the collarbone area and have an ergonomic taper in the chest area. Offering a women's specific cant and a narrower cut the hipbelts found on Osprey's women's packs also cater to female users.

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 Sirrus 50 Women’s pack is available in Xsmall/Small (fits torso lengths ranging from 13”-17”) and Small/Medium (16”-20”) size options. Adjustability in the harness load-lifter straps and sternum strap enhance fit.

The storage capacity of the Xsmall/Small size is 2868 cubic inches and the Small/Medium 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.

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 Sirrus 50 Women’s 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
27" x 13" x 14"
Fits Torso
Xsmall/Small: 13" - 17"
Small/Medium: 16" - 20"
Frame Material
Hydration Compatible
Maximum Weight
40 lbs
Sternum Strap
Yes; Adjustable
Torso Adjustment
Xsmall/Small: 2868 cu in
Small/Medium: 3051 cu in
Limited Lifetime
Internal Frame Backpack
Main: 210D Nylon Crosshatch
Accent: 420HD Nylon Packcloth
Bottom: 420HD Nylon Packcloth
Item Weight
Xsmall/Small: 3.46 lbs
Small/Medium: 3.58 lbs

9 Reviews

4.56 / 5

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Gavin S.


excellent weekend backpack


my daughter loves it



Vicki L.


Not 50L


Hugs my hips wonderfully and was so comfortable to wear. I only use my trekking poles for downhill, so it was nice to have the stow on the go attachment for when I don't want to use my poles. Great number of pockets to keep small things organized.


Not a true 50L pack. My first pack which I still have is 50L and I'm able to fit more into my old pack than the Sirrus. The Sirrus can barely hold a sleeping bag, tent, and some food while my old pack can fit all that plus another sleeping bag.

Yvette M.


Perfectly fitting backpack!


Quality construction; very comfortable and easily adjustable; perfect size for my petite frame (and I had to search widely for a pack that would fit me properly!); holds everything that I need for overnight hiking; rain cover is a plus! I also love the purple color.


None yet!

Feiyi W.


Too large for girls under 165cm


It's functional bag with a lot of useful pockets. I actually like it so much.


But the bag itself is already 3.4 lbs. If you put camera, lens, tripod, and other stuff for traveling, and if your height is under 165cm, it will be too heavy and large for you to handle. Also, I don't want to check in any bags in airport while the size of the bag is larger than the standard on-boarding size. So after thinking over and over, I decided to return it and get a bag under 40L.



Light Weight & Features


Love the hip belt pockets on both side. The hip belt pad is soft, cushioning; therefore, does not cause pain or bruise my hips. Like the color: Ruska Purple; the actual color is more like Maroon or Burgundy. The air speed back helps keeping the sweat off my back.


The shoulder and load bearing straps are small and slipping off after a while of hiking but they are not a major issue for me.

Tiffany H.




I haven’t actually had the chance to use this pack yet for hiking, but I absolutely love the color, style, and size of this pack! The actual color is a bit different than what is shown on the computer screen, but I love the more magenta color of the pack.


I think the side pockets could be a little bigger to store a few more items or a bigger phone.

Elaine K.


Versatile backpack


The size is most ideal for multi-day, short weekend hikes and backpacking, and good for travel abroad backpacking


Want more options in color!

Heather D.


Love Love Love!


This pack is the perfect size for light travel. I went on a 2 week long international trip. This was big enough to bring everything I needed and still get a few souvenirs.


I would like it to have a day bag attached.

Jenna E.


Great backpack


Good zippers, pockets, and integrated rain cover.


black and orange color