The 155 tool cases are designed for technicians or supervisors who have to travel with their tools. The 155 carrying case is a rugged and durable all plastic case - without wheels - made of high impact co-polymer resin with a pressure relief valve. This series of cases is virtually indestructible. The 155 tool carrying case, like all the 150 Series, is airport friendly. It has a fold-down and locking plastic handle and two positive-action latches with padlock loops for an optional padlock such as our TSA Safety Lock, part number 61-6147 that you can lock and TSA officials can open. The 155 tool case accepts optional 14.00” (large) tool case pallets.