The Pelican 1624 Waterproof 1620 Case with Dividers (Black) is an unbreakable, watertight, airtight, dustproof, chemical resistant and corrosion proof hard case used to carry any kind of equipment that needs to be protected from the elements. It is made of Ultra-High Impact structural copolymer that makes it extremely strong and durable. It has a 0.25" (6.4 mm) neoprene o-ring, ABS latches that seal perfectly and includes an automatic purge valve for quick equalization after changes in atmospheric pressure.