The Osprey SIRRUS 26 II hiking backpack was inspired by the patented AntiGravity™ back system technology. It is specially designed for women. It is fully adjustable and features a combination of a unique, back system and a waist strap with highly breathable mesh. This ensures great level of comfort even in hot weather and with the backpack fully loaded. The main compartment with a zip pocket can be accessed through a lid opening with draw-cord fastening. Under the lid, you will find a mesh zip pocket with a key clip. More openings are in the lower part of the backpack and on its side. The backpacks many pockets include a big zip pocket in the centre and two side pockets with a zip for snacks and smaller items. If you’re going trekking, you’ll also love the Stow-on-the-Go System™, which allows you to easily attach your poles. Inside the backpack, you will find a detachable divider for better organisation of your belongings. The Sirrus 26 II is water bladder compatible.