This is an aluminum alloy suitcase designed based on the market's all-aluminum alloy carry-on luggage. Its advantages include customizable size and color without being restricted by the frame structure. The length, width and height can be adjusted freely. It is mainly used for packaging high-end instruments and electronic products. Passengers with a size of 16 to 20 inches can board the plane. The interior can be designed with shock-absorbing cotton, pockets, instrument box panels, etc. as required.