The D38 is constructed of RF welded 22-ounce vinyl that guarantees 100% waterproof performance even when submerged. The D38 features a rigid core that enables the bag to be mounted to any bike, with or without a top rack, even when the bag is completely empty. Try that with a traditional dry bag! The rigid construction and unique four-point strap mounting system work together enabling easy access to contents without loosening straps or removing the bag from the bike. Features: Rigid Core construction. Modular packing (mates with D20 and D28, sold separately). Universal slip-lock mounting straps (included). Mounts with or without top rack. Infinitely useful daisy chain mounting strip. Retro reflective logo. Adjustable and detachable carry handle. Strap keepers to secure excess webbing. Specs: 38 liters.