Osprey Siskin 8 Hydration Backpack vs Osprey Ultralight Stuff Backpack

The main difference between the Osprey Siskin 8 Hydration Backpack and the Osprey Ultralight Stuff Backpack is that the Siskin 8 Hydration Backpack has Sternum / Chest Straps (Adjustable sternum strap with magnetic valve) while the Ultralight Stuff Backpack does not.

Osprey Siskin 8 Hydration Backpack Front View
Osprey Ultralight Stuff Backpack Front View
Specs Brand Osprey Osprey
Name Siskin 8 Hydration Backpack Ultralight Stuff Backpack
Category Hydration Hiking
Sub Category Outdoor Daypack
Capacity (L) 8L 18L
Dimensions (in) 18.5 x 8.5 x 6.9 17 x 9 x 7
Weight (lb) 1.2 0.2
Fabric 900x600D Polyester 40D Nylon Ripstop
Color 3 colors and patterns 4 colors and patterns
Warranty Osprey Lifetime Warranty Osprey Lifetime Warranty
Release Date December 5, 2018 May 30, 2015
Rating 4.8 4.6
Price Under $100 Under $50
General Features Shoulder Straps Adjustable shoulder straps Breathable mesh shoulder straps
Sternum / Chest Straps Adjustable sternum strap with magnetic valve
Main Compartment Access Full front zipped access Normal zipped access
External Pockets Top zipped pocket 1 zipped top pocket and 2 side pockets
Internal Compartments Internal scratch-free slash pocket
Side Pockets Side pockets can fit water bottle
Water Bottle No Yes
Handles Top grab handle Top grab handle
Loops and Attachments LidLock helmet attachment, ;oop for blinky light attachment
Travel Features Packable / Foldable Folds into its built-in storage pocket
Compression Straps External compression straps
Hiking / Backpacking Features Back Panel Mesh-covered extra deep ridged foam with center air channel
Reflective Safety Strips Reflective accent
Hydration Features Bladder Size Includes Osprey Hydraulics LT 2.5L reservoir by Hydrapak
Hydration Compatible Yes

You're currently comparing the Siskin 8 Hydration Backpack by Osprey against the Ultralight Stuff Backpack by Osprey .


Osprey 's Siskin 8 Hydration Backpack is a Hydration backpack with Outdoor features while Osprey 's Ultralight Stuff Backpack is a Hiking backpack with Daypack features.

The Osprey Siskin 8 Hydration Backpack has a capacity of 8L (liters), weighs 1.2 pounds and it's dimensions in inches are 18.5 x 8.5 x 6.9. It's made of 900x600D Polyester and is available in 3 colors and patterns in comparison the Osprey Ultralight Stuff Backpack's capacity is 18L with a size of 17 x 9 x 7 inches. Constructed from 40D Nylon Ripstop it weighs 0.2 pounds and is available in 4 colors and patterns .