The Pelican 1524 Watertight 1520 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, which makes it extremely strong and durable. It includes a 0.25" / 6.4mm neoprene O-ring, ABS latches that seal perfectly, and an automatic purge valve for quick equalization after changes in atmospheric pressure.