3i Series Cases are injection molded from ultra-high strength polypropylene copolymer resin, specified by the U.S. military for cases and containers. Features a gasketed, water and dust-tight submersible design, meeting military standard MIL-C-4150J. The automatic ambient pressure equalization valve self-regulates for different altitudes meeting military standards MIL-STD-648C and IP67. It is resistant to UV, solvents, corrosion, fungus and impact damage, surpassing military standard MIL-STD-810F. Features a continuous molded-in hinge with stainless steel pin, a patented trigger release latch system, and a comfortable, snap-down, rubber over-molded handle. All 3i Series Cases are backed by an Unconditional Lifetime Warranty. Key locking "TSA" accepted versions also available.