DESIGN & DETAILS: Constructed with heavy-duty 21 oz TobaTex body with a reinforced bottom of 34 oz TobaTex Expandable for over 3900 cubic inches of storage capacity but can be cinched down with four compression straps to compact and stabilize gear Aluminum fasteners on the compression straps increase durability and eliminate busted buckles The StormStrip(TM) closure system provides a confident seal and allows for easy top loading access The adjustable backpack harness with padded shoulder straps makes carrying your gear around rapids or into a secluded camp easy and comfortable> The backpack harness is removable. This is a handy feature when flying with the bag, reducing baggage handling snag points