It is made of ultra-high-impact structural copolymer that makes it extremely strong and durable. It has a 0.25" neoprene O-ring, four easy-open double-throw latches that seal perfectly. It has a built-in automatic pressure equalization valve for changes in altitude or temperature. The case uses stainless steel hardware and has padlock protectors to provide added strength and extra security against cutting and theft. It is carried by three comfortable rubber overmolded haul handles, a retractable handle and built-in wheels.