The popular Exos backpack is equipped with an airy mesh back panel. The materials and details are made with weight control in mind. - Materials are 100% recycled - The hip belt has convenient pockets - Adjustable Airspeed carrying system - The main material is 100 denier ripstop nylon - Detachable flap pocket - The backpack has a FlapJacket cover that protects the upper opening if you remove the flap pocket - Elasticated front pocket - Flexible side pockets - Attachment points for loose straps - Two ice axe holders - Stow-on-the-Go hiking pole holders - Detachable straps for attaching the sleeping pad - Chest strap with an emergency whistle on the buckle