The legendary Boundary Pack is perfect for everything from canoeing and canyoneering to protecting your gear on trains, buses, and burros. It features our watertight Dry Seal™ roll-top closure, along with a heavy-duty, 30-ounce scrim-reinforced vinyl bottom and 19-ounce scrim-reinforced vinyl body. A lightweight suspension system includes waterproof and ventilated shoulder straps, as well as a waist belt on every size.