Pelican 1440 Case With Padded Divider and Lid Organizer Watertight, Crushproof & Dustproof Open Cell Core With Solid Wall Design Strong & Lightweight Automatic Pressure Equalization Valve O-ring Seal Watertight, crushproof & dust proof Open cell core with solid wall designstrong, light weight Automatic pressure equalization valve O-ring seal Comfortable rubber over-molded handle