Watertight, crushproof, and dustproofStrong polyurethane wheels with stainless steel bearingsOpen cell core with solid wall design - strong, light weightRetractable extension trolley handleEasy open double-throw latchesStainless steel hardware and padlock protectorsAutomatic pressure equalization valve - balances interior pressure, keeps water outComfortable rubber over-molded top and side handlesO-ring sealDIMENSIONSInterior (L×W×D) 19.75 x 11.00 x 7.60 in(50.2 x 27.9 x 19.3 cm)Exterior (L×W×D) 22.00 x 13.81 x 9.00 in(55.9 x 35.1 x 22.9 cm)