A lightweight full carbon trunk made using infusion molding. We succeeded in ensuring rigidity while being lightweight by arranging three types of carbon fiber in each direction. The outer and inner parts are designed to use 3M panel bond to ensure both adhesion and rigidity. The back side has been trimmed leaving only the bare minimum required. The weather strip remains, ensuring waterproofness. The high mount stop lamp fixing part is designed to be strong and prevent the lens itself from moving (improving waterproofness). The trunk stay/catch part is equipped with a nut, so you can install it if you have a bolt available. Although it is lightweight at approximately 2 kg, the so-called genuine holes that secure the genuine spoiler and Mazdaspeed wing are reinforced, so they can be installed by drilling the holes. *When driving on a circuit, etc., please modify it to suit the driving scene. We perform processing to eliminate hollow parts as much as possible.