Shop the largest selection of ProX VaultX cases In Chicago. VaultX Cases are made from Polypropylene Copolymer, these cases are crush resistant, and virtually indestructible. This rugged case features an sealed ring, which makes it Airtight and Watertight. The automatic air pressure release valve will equalize the air pressure, which allows this case to be airline friendly! ATA/TSA approved and Ideal for Air Travel. An excellent way to keep your microphones safe, dry, and out of harm's way when you travel either locally or long distances. Highly recommended to give you ultimate protection for, Mixers, Microphones, Guitars and many other Pro Audio Gear.