The Osprey Sirrus 36 II in Muted Space Blue is a medium-sized hiking backpack with a capacity of 36 liters and a top filling for easy packing. The AirSpeed ​​system ensures ventilation of the back, which you will appreciate on longer trips. The equipment includes a rain cover, space for a hydration bladder, mesh on the sides, zip access to the main compartment and pockets on the belt for small items.