SKB Injection Molded Empty Equipment Case Mil-Standard, Submersible, Multi-Functional Equipment Transport Case: Empty (No foam) Internal Dimensions: 12" x 9" x 4.5", 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.