High Sierra Fat Boy Backpack Large, multi-compartment design.Angled, adjustable compression straps. Premium organizer compartment with Zippered accessory pocket on the front. MP3 player pocket with headphone port S-shaped, VAPEL mesh AIRFLOW padded shoulder straps with Suspension System and integrated media/cellphone pocket Comfortable padded core back panel. Contoured grab handle.Monster hook for attaching extra gear. Materials: Duralite Ripstop, 600-denier Duralite, Waffle Weave Size: 19.5" x 13" x 7"Capacity: 2382 cubic-Inch