iSeries 5616-9 Waterproof Utility Case (empty) SKB iSeries Injected Molded Mil-Standard Waterproof Cases are molded of ultra high-strength polypropylene copolymer resin, featuring a gasket-sealed, water and dust tight submersible design (MIL-C-4150J). This case features a molded-in hinge, patented trigger release latch system, comfortable, snap-down rubber over-molded cushion grip handle and a automatic ambient pressure equalization valve (MIL-STD-648C). Our iSeries line is resistant to UV, solvents, corrosion, fungus and impact damage (MIL-STD-810F).