The Pelican 1750NF Long Case (Od Green) 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 impact damage. 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, easy-open double-throw latches that seal perfectly. It includes an automatic purge valve for quick equalization after changes in atmospheric pressure.