Integrated wheels with stainless steel bearings Extending trolley handle for rolling travel Watertight rubber O-ring seal, crush-proof, and dust-proof Automatic pressure equalization/purge valve that balances air pressure inside the case Super-light HPX 2 polymer, up to 40% lighter than other polymer cases Five easy open double throw latches Ergonomic comfort grip rubber over-molded handles Card holder that can be placed on front or side Stainless steel hinge pins and reinforced padlock protectors