Aeris JetPack Complete Scuba Diving Travel System Convertible BC/BCD Dry Backpack BC:One size fits all = custom fit for everyone: adjustable harness, cummerbund and lumbar, Adjustable position weight pockets, rugged (not your typical travel materials) construction Quick dry 800 denier double-coated nylon Bag: 42 liter semidry, Water-resistant zippers for all compartments, Hide away backpack straps Laptop sleeve with easy zippered access