315D HADRON AC² nylon with Hadron is light, ultradurable, and waterproof Proprietary Hadron LCP (Liquid Crystal Polymer) grid fabric is incredibly light and exceptionally durable External WaterTight zippered pocket with key clip and internal security pocket secure small essentials Extension skirt expands capacity Six integrated front lash points let you customize external carry Bungee system compresses load and can carry crampons, ice tools, or a belay parka | Top strap secures a rope | Two dog-bone attachments secure ice tools | Glove-friendly pull-to-open/pull-to-close drawcord main compartment with webbing pull-tabs for quick, easy access | Lightly padded thermoformed shoulder straps are durable, light, and comfortable | Rigid, thermoformed back panel provides support, structure, and a comfortable carry | Embedded RECCO® reflector can aid search and rescue in emergency situations