EXPLORER Cases are built stronger to last longer. Made of Copolymer Polypropylene Compound, EXPLORER Cases are stronger and lighter than competitive products. Designed for military use, EXPLORER Cases were the first to achieve the new military standard qualifications. Exceeding all TSA airline requirements, EXPLORER Cases are watertight, crushproof, sand and dustproof and corrosion proof. With super-strong rubber-coated handles, double-throw latches, a manual purge valve for greater protection and more padlock holes for better security, EXPLORER Cases are the strongest molded protection cases in the world. The 5833 incorporates a telescopic handle with a quick and safe lock/unlock system and self-oiling heavy duty ball bearing wheels.