The black Pelican 1640NF Transport Case without Foam 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 from 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 it includes an automatic purge valve for quick equalization after changes in atmospheric pressure.