The Aqua Lung Ocean Pac is a heavy-duty backpack made with reinforced ballistic nylon and designed to carry a complete set of gear. 1680 Denier Ballistic nylon with heavy-duty rubber coated mesh. Heavy-duty YKK tooth zipper with anatomic zipper pull extenders. Padded backpack straps with adjustable sternum strap. Soft foam spine pad and neoprene back pad. Elastic drawstring closure with barrel lock.