Watertight, crushproof, and dust proof. Open cell core with solid wall design - strong, light weight Automatic Pressure Equalization Valve. O-ring seal. Comfortable rubber over-molded handle. Stainless steel hardware and padlock protectors. 2 level Pick 'N' Pluck™ with convoluted lid foam. Personalized nameplate service available. Unconditional Lifetime Retractable extension handle. Strong polyurethane wheels with stainless steel bearings. Guarantee of Excellence.