2-level Pick N PluckTM with convoluted lid foam Watertight, crushproof, and dustproof Open cell core with solid wall design-strong, light weight Comfortable rubber over-molded top and side handles Easy open double-throw latches Stainless steel hardware and padlock protectors Automatic Pressure Equalization Valve balances interior pressure, keeps water out Strong polyurethane wheels with stainless steel bearings Retractable extension handle O-ring seal Available with foam (WF) or no foam (NF) and with logo (WL) or no logo (NL).