The Pelican 1550 case No Foam - Orange is unbreakable, watertight, airtight, dustproof, chemical-resistant and corrosion-proof. It is made of ultra-high impact structural copolymer that makes it strong and durable. Its exclusive ¼-inch (6.4 mm) neoprene O-ring and ABS latches seal perfectly and includes an automatic purge valve for quick equalization after changes in atmospheric pressure. Your equipment can fit into the high-density foam for total subjection and protection against impact, vibration or shock. This case is NATO codified and tested to MIL C-4150J (Military Standard), IP-67 (Ingress Protection) and ATA (Air Transportation Association).