SKB Injection Molded Cubed Foam Equipment Case Mil-Standard, Submersible, Multi-Functional Equipment Transport Case: Cubed Foam Internal Dimensions: 9" x 7" x 4"; Weight: 4 lbs. Ultra high-strength polypropylene copolymer resin; resistant to UV, solvents, corrosion, fungus and impact damage. Automatic ambient pressure equalization valve. Cases stack securely and accommodate padlocks.