These US military surplus cans were used to hold ordnance during various military operations. They are known as 81mm Mortar Cans/Crates/Chests or C374MK2 cans. They have a hinged lid. Like all C374MK2 cans, these do NOT have rubber seals.
Outside Dimensions: 14 1/2" x 5 1/2" x 22 1/2"