SKB Cases 3I-20118LENS SKB iSeries Camera Cases for Canon C300/C500 (Black) SKB's iSeries injection molded waterproof cases are constructed of ultra high-strength polypropylene copolymer resin and feature a gasketed, waterproof, submersible design Lifetime Guarantee Resistant to corrosion and impact damage Molded-in hinges, patented "trigger release" latch system Snap-down rubber over-molded cushion grip handle, secure stacking, and automatic ambient pressure equalization valve (MIL-STD-648C) all contribute to its military grade design.