Rated 5 out of 5 by from Daypack for geologic field work As one of my last purchases for geologic mapping field camp I was convinced by a store employee to go with the Osprey Sirrus 36 in Stealth Grey (which is actually more of a dark green.) The pack has been through almost a month of abuse through thick brush, rain, mud, sharp shaley outcrops, etc...The bottom compartment is perfect for rain gear, thermal layers, and hats and gloves. Inside the main portion I am able to lug around a map board, brunton compass, GPS, pack of pens, pencils, rulers/scales, the large 1.5 L Nalgeen, and lunch. There are two handy pouches on top that I use for my phone, first aid stuff, or little things that get lost easily. There is what seems to be a laptop pouch in the main body, but fitting anything in there is a little weird with how the pack frame curves. Overall the XS Women's is a perfect fit. I'm about 5'4" and have a smaller frame and torso, but hauling around all my gear for 10 hours a day up and down steep ridges hasn't been a problem. I'm glad I was able to shell out the cash for this pack, it's been well worth it.
Date published: 2015-07-07
Rated 5 out of 5 by from The most comfortable pack I ever had! I bought this pack for my Hut to Hut hiking through the White Mountains in NH, and it was just the right size for my clothes and other essentials, and hydration pack. It was easy to find my items when I needed them and all the smaller pockets were just right for my camera, sun glasses, snacks, lip balm, etc.
Date published: 2014-07-31
Rated 5 out of 5 by from Used for Search and Rescue This has been my 24hr bag for for Search and Rescue over 2 years. I have done personal 3 day hikes with it many times because it's just that comfortable. It has endured harsh abuse with getting thrown amongst our SAR gear in the back of the truck, basket of the heli's or in our boats, and is still going strong. It's a perfect size for SAR. I love this pack!
Date published: 2016-03-25
Rated 5 out of 5 by from Great! Used it for a week in Chiapas and a week in Quintana Roo/Yucatan. Overall great backpack, comfortable, adjustable. Love all the different openings to squeeze in more stuff and get out my things more easily. Lots of space. Only thing is the water bottle pocket is a bit tight, so it was hard to squeeze the bottle in without it falling. I'd buy it again!
Date published: 2015-03-29
Rated 5 out of 5 by from Best fit for 5'1'' woman This review concerns the Osprey Sirrus 36 size XS/X women's specific design pack. I own more than a dozen backpacks/daypacks from various manufacturers (ranging from expensive to cheap), and this is my favorite for something that can carry 20-30 pounds. First and foremost, it is the right size for someone my height, which I had not succeeded in getting in unisex packs or men's packs. With my gear in it, the pack weighs about 28 pounds, and despite the fact that my standard hike is 8 miles up and down a mountain with a significant elevation change, I scarcely notice that I'm carrying it, because it fits so well. This has become my default pack. Other features I especially appreciate: -- The zipper pulls are wonderful. Sturdy and round, they are very comfortable to pull and work better than any other pulls I've had on any other bags. -- The zippers work well -- no getting caught all the time. -- The trampoline back does help avoid overheating. -- The bottom outside zipper pocket (intended for a sleeping bag) gives me easy access to my rain gear, useful if there is a sudden shower, because I don't have to open up the pack and root around in it in a torrential downpour. -- The main compartment of the pack does have two access points, the top and the essentially the whole front of the pack, which helps if one wants to get something from the middle or bottom of the pack without taking everything out of it. Is there anything not to like about it? A few minor points: -- The color (green) is named "stealth gray." (It's so stealthy I never would have guessed it.) -- Apparently because of the trampoline back that moves the pack a little further away from my back, I cannot get water bottles (that I use for electrolyte replacement, instead of putting powder into a water bladder and creating a cleaning problem) out of the outside side mesh pouches when I am wearing the pack. -- The zipper hip/waist pouches (fanny packs) are too small for my cell phone with its external battery attached, too small for Clif Shot Bloks without bending the packages, etc., and are hard to reach when I am wearing the pack. -- Because it is hard to reach anything in the pack (see above) when wearing it, I am currently wearing a safari vest with the pack so that I have some items within easy reach (e.g., cell phone, Personal Locator Beacon, Garmin GPS, map, snacks, electrolyte replacement powder, pocket camera, etc.) For example, if the PLB were in the pack and I fell and couldn't get the pack off, the PLB would not do me any good. Etc. -- This pack shares a characteristic with most (but not all) other packs, which is that one has to essentially unpack the entire pack to get the water bladder in after filling it. This is inconvenient. All of the above said, I would not do day hikes with any other pack.
Date published: 2016-01-19
Rated 5 out of 5 by from Best hiking day bag! I'll be extra short on this review!! IT IS THE MOST COMFORTABLE BACKPACK I ever had, and I'll let you guys the pleisure to try one of the best bag EVER!!!!
Date published: 2016-07-11
Rated 4 out of 5 by from Just used once My first real good backpack. I do like it but I did struggle a bit with trying to attach the hiking poles to the backpack in midst of trekking. I think it is just me and need to get used to all of the bells and whistles on this. My one complaint is that I wish the little waist zip pockets on belt would be just a touch bigger. Can't fit a regular size iphone in it which would have made this awesome.
Date published: 2016-06-29
Rated 4 out of 5 by from Did the job! I love my purple orchid sirrus 36!. This day pack was large enough to fit three days worth of hiking clothes, but would have loved it more, if it had more pockets. Some zip pockets on the inside would be ideal.
Date published: 2016-04-18
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Questions & Answers

When packed, will this pack fit the size/weight requirements to go in the cabin of a plane?

Asked by: bbates225
Dimensions say 24x11x9.  Surely we can smoosh the top compartment down 2". Ex: American Airlines carry on measurements 22x14x9
Answered by: The1stOhsuziq
Date published: 2017-01-27

Will this Osprey Sirrus 36 be BETTER for Camino de Santiago than the Sirrus 24?  I think 15lbs is all we need to carry.

Asked by: Retired Rooster
I have just returned from walking the entire Camino Frances with my Osprey Sirrus 36.  This pack was quite popular and loved by everyone carrying it.  The size was just right to include my rain poncho and a compact, light weight sleeping bag (not always a necessary item but well appreciated when needed).  
Answered by: Sparrowearl
Date published: 2016-09-09

How do I determine my size? Is the torso measured from the shoulder to the waist?

Asked by: INDIOMEL
Please read this article which explains torso length:
Answered by: REIservice
Date published: 2015-09-20

I'm short and fat, 19" long torso, 43" hips. Any chance this will fit me?

Asked by: Squattie
​The S/M size in this pack should fit. The hip belt fits a size range from 29 to 44 inches. Should you need more room when layers are on, Osprey can make you an extension that is specific to this pack if you choose to contact them directly.
Answered by: REIservice
Date published: 2016-12-30

what year is this model?  will osprey be updating anytime soon?

Asked by: kallie
This is the newest model of the pack. Please contact Osprey directly to inquire about future updates to their packs.
Answered by: REIservice
Date published: 2016-10-07

Is this pack compatible for a water bladder/camel back?

Asked by: Eva7
Yes, any size hydration reservoir will fit in the Sirrus 36 Pack:
Answered by: REIservice
Date published: 2016-08-28
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