The SKB 3R6820-20B-EW rSeries Mil-Standard cases have been designed to meet the most exacting military specifications. They are roto-molded of impact-resistant/UV stabilized LLDPE for strength and durability, featuring airtight and waterproof construction with solid stainless steel latches and hinges that will withstand the most demanding shipping conditions. This size features built-in wheels. Our rSeries cases come standard with an empty interior, and some models are available with: cubed foam, layered foam, padded dividers, and a pull handle with wheels.