SKB's 3I Series of waterproof cases are the perfect solution for storing and transporting your delicate electronics, A/V equipment, microphones, mixers, cables, computers, percussion instruments, audio equipment, and music accessories. 3I Series injection-molded waterproof cases are constructed of ultra high-strength polypropylene copolymer resin and feature a gasketed, waterproof, airtight, submersible design that is resistant to corrosion and impact damage. The SKB case's continuous molded-in hinge; patent pending "trigger release" latch system; comfortable, snap-down rubber over-molded cushion-grip handle; secure stacking; and automatic ambient pressure equalization valve all contribute to its military-grade design. This Military Standard SKB case includes a two-stage pull handle and wheels.