I actually just picked one up today. As others have said, there's about 6" of a pallet under the tool box wheels. Outside the cabinet is 1/2" foam, a double walled box, and 1/4" plywood tacked to 1/2" plywood "crate" on each side. The top of the cabinet has another 1/2" of foam, a double walled box top and probably another 3/4" for the exterior crate. Good luck with your purchase, I looked through all the local tool stores and came to the conclusion that most carried some version of the Harbor Freight box for around 1.5x the on-sale price.