Featuring a women’s specific fit the Sirrus series includes Osprey AirSpeed trampoline mesh style back system. Providing un-paralleled levels of comfort and ventilation when hiking the trails. The spacermesh harness and hipbelt also feature ventilated EVA foam cutouts. In warm climates hydration is important and you’ll appreciate the internal hydration sleeve built into all Sirrus models. When the water is cascading from the clouds, deploy the integrated raincover, instantly protecting your pack and gear from the elements. Access the main compartment through the dual buckle top lid with integrated zipped pockets. Keep the rest of your gear neatly organised in the dual hipbelt zipped pockets and twin mesh side pockets with over the pocket or under the pocket side compression. For longer trips or overnight hut excursions, attach a sleeping pad to the removable external straps. Need your hands free for a short scramble? Osprey's unique Stow-on-the-Go system means no more ‘on and off’ to store your trekking poles, just simply pass the poles through the two elasticated loops for an easy hands-free solution. A single ice axe loop may also prove useful in snow and ice conditions.