Osprey SIRRUS 26 W II S/M backpack is inspired by patent AntiGravity back system technology. It is specially designed for women, it is fully adjustable, features highly breathable back system in combination with unique back system construction and waist strap with highly breathable mesh. Main compartment with a zip closure, separated mesh pocket with a key clip, another backpack access from the bottom of the backpack and from the side. If you’re going trekking, you’ll love the Stow-on-the-Go System™ for attaching poles. Simply attach poles with two elastic eyelets. It features a detachable divider on the inside, which divides the backpack in two chambers. Water bladder compatible.