The packaging for an approx. 30-kg POS register, which is to be further assembled in Japan after being manufactured in China, requires “high strength,” “ease of workability,” and “low cost.” In consideration of workability, “half tray + semi-A type” and “hanging on the inner flap structure” is applied, and the joint was eliminated. Also, the assemble style bottom tray and the side-slide structure makes workability easier, and unite of bottom tray and reinforced pad makes to reduce the number of parts and increase strength.