Briggs & Riley Relay Convertible Brief, Black, One Size 400D lightweight nylon twill fabric resists moisture, wear, dirt and abrasion Durable, soft-touch neoprene handles provides a comfortable grip Ergonomic, lockable zipper pulls Brief easily converts to a backpack by pulling out padded straps from back panel and clipping them into bottom d-rings Aerated mesh back padding allows air to circulate against body, keeping back cool