The Pelican™ 1550 case No Foam (Orange) is unbreakable, watertight, airtight, dustproof, chemical resistant and corrosion proof just like all Pelican™ Cases. It is made of Ultra High Impact structural copolymer that makes it extremely strong and durable. Its exclusive 1/4" (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). Unconditionally Guaranteed