Mil-Standard, Submersible, Multi-Functional Equipment Transport Case: Empty (No foam) * Internal Dimensions: 9" x 7" x 6"; 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.