Padded removable sleeve for 15"-17" laptop computers,Strong polyurethane wheels with stainless steel bearings,Three removable accessory pouches,Watertight, crushproof and dustproof,Open cell core with solid wall design - strong, light weight,Retractable extension handle,Easy open Double Throw latches,Automatic Pressure Equalization Valve - balances interior pressure, keeps water out,O-ring seal,Comfortable rubber over-molded top and side handles,Lifetime Guarantee of Excellence,Dimensions: Interior (L x W x D) 19.92" x 14.98" x 9.00" (50.6 x 38 x 22.9 cm),Dimensions: Exterior (L x W x D) 22.07" x 17.92" x 10.42" (56.1 x 45.5 x 26.5 cm)