The 3i-1309-6GP4 features a dual layer custom cut foam interior that will accommodate four GoPro cameras, includes a storage compartment for accessories as well as slots for batteries and features a lower layer for accessory storage. The foam interior is constructed of a high quality Stratocell foam with a contrasting red capped foam top.iSeries injection molded waterproof cases are constructed of ultra high-strength polypropylene copolymer resin and feature a gasketed, waterproof and airtight, submersible design (IP67) that is resistant to corrosion and impact damage. Its molded-in hinges, patented " mini trigger release" latch system, comfortable, 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.