The Sirrus 36 women’s hiking backpack has a fully adjustable, highly breathable AirSpeedTM back system, which is a combination of a unified design of the back system and a waist belt with a highly breathable mesh. You will certainly appreciate the unique Stow-on-the-Go System™ for attaching the poles to the backpack, where you simply push the poles through two elastic loops. The adjustable length of the back system ensures that the backpack fits exactly on your back. The backpack has a special space for a hydrobag between the back system and the backpack and there is an loop for attaching it. The backpack is equipped with a padded waist belt with pockets, a chest strap with an emergency whistle, an integrated rain cover, removable mat straps, ice ax loops and plenty of pockets for perfect organization of stored items. You can put things in the main pocket by opening the flap or via the zip on the front of the backpack.