The Pelican 1550EMS Case with EMS Organizer/Dividers (Black) is an unbreakable, watertight, airtight, dustproof, chemical-resistant and corrosion-proof hard case used to carry emergency medical supplies. It is made of Ultra High Impact structural copolymer that 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. The case is NATO-codified and tested to MIL C-4150J (Military Standard), IP-67 (Ingress Protection) and ATA (Air Transportation Association) 300 specifications.