The Ape Case ACWP6035 Medium Waterproof Hard Case features American made engineering and design. Made with rugged Copolymer Polypropylene, Ape Case waterproof cases are watertight, dust proof, and feature protected latches and hinges, stainless steel hardware, O-ring seals, rugged handles, pressure relief valves, pick and pluck foam interiors, and more. The lid hinge features a stainless steel bar system that runs the entire length of the case for the strongest hinge possible. This case has an automatic pressure equalization valve that keeps the air pressure inside the case the same as the outside which protects the case from damage. .There are two built-in padlock slots suitable for standard or TSA approved locks.