Osprey Sirrus Pack

Item No. 877257-10000821

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Product Description

The Sirrus Series pack is your extremely durably and ventilated pack, for long all day hikes, that require extra breathability, featuring loads of attributes. Featuring adjustable torso lengths, improved specific fit, and comfort for an athletic fit and aesthetics. The Sirrus Pack is your go to pack for long one day hikes, or lightweight over nighters. Don't fear when bad weather turns, the Sirrus keeps all of your gear and your pack dry, with an intergrated rain cover.///// 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/////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
LightWire alloy frame creates low profile air space optimizing pack balance and ventilation
3D tensioned breathable mesh backpanel ensures supportive fit
Sewn-in spacer mesh
Adjustable sternum strap with safety whistle
Mesh covered ventilated die cut foam
Multiple torso size options with torso adjustability

Customer Reviews

5.0 / 5.0
3 Reviews
5 Stars
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1 Star
Rated 5 out of 5
First Osprey pack and totally love it
This is the first backpack I've bought from Osprey and I am so pleased with my purchase. It is highly adjustable and able to pack quite a load. I am 174cm tall and got fitted for the XS size as I have quite a small torso. The pack fits like a dream and doesn't bother me at all. I recently took it on a hike down the Grand Canyon (5 hours hike, nothing too serious) and it carried my 3l water bladder, extra jacket and snacks perfectly. I can't wait to take it on an overnight trip, loaded with sleeping equipment and possibly a lightweight tent. I can't recommend this pack enough.
November 26, 2018
Originally posted at
Rated 5 out of 5
Great UL Backpacking Bag
I've taken this bag on several day adventures as well as lightweight multiday treks. It does squeak a little when it's lightly loaded but I hardly noticed. For the three day treks was able to fit all my gear inside the bag as well as a 3L bladder and two Nalgens in the mesh pockets (I had no problem using these side pockets even with a fully loaded bag). I'm very happy with this bag, it is extremely comfortable

I wish the front pocket was mesh similar to the larger bags
The "brain" at the top of the bag is stitched in place and therefore cannot be adjusted for an oversized load.

Im disappointed with the number of reviews commenting on this bag's inability to hold a phone in the hipbelts, in my mind this shouldn't be a deal breaker
May 29, 2018
Originally posted at
Rated 5 out of 5
I LOVE this backpack.
This backpack is unparalleled for comfort. I have significant shoulder and back problems, and I have been through a bunch of backpacks, finding nothing but pain with each one. This backpack literally feels like nothing on my back. It is almost magical. I can load the backpack up with my heavy textbooks, laptop and lunch, and it hardly feels like anything as I hike up and down the hills in my town. The only downside: I wish they made a backpack with this wonderful harness system but with a more student lifestyle pocket system. Other reviews mention a squeak - there is a squeak but I hardly notice it at all.
January 6, 2018
Originally posted at