ProX's VaultX series 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! It is ATA/TSA approved. There is convoluted foam glued into the lid, and a removable pluckable foam set in the base will allow you to customize the fit to anything you would like to protect!