High Sierra Opie Backpack Large front-load main compartment. Multi-compartment design. Front zippered accessory pocket for quick-access items like ID and change Core organizer with mesh pocket andpen pockets. MP3 player pocket with customized,zipper-stop headphone port. Side mesh pocket holds a beverageor extra gear. S-shaped padded shoulder straps withhandy cell phone pocket Comfortable padded core back panel. Contoured daisy chain loops forattaching extra gear. Comfortable, heavy-duty webbing grab handle Materials: Mini-Hexagon Ripstop, Waffle Weave, 600-denier Duralite Size: 18.5" x 12.5" x 8.5"Capacity: 1800 cubic-Inch