This eco-friendly bag can be used to carry items such as bento boxes, sushi, sashimi, prepared foods, and sweets (hereinafter referred to as "contents") while keeping them horizontal. Hooks A1, A2, B1, B2, C1, C2, D1, D2, E1, E2, F1, F2, G1, G2, H1, H2, I1, and I2 on the front, back, and left and right sides securely hold the contents according to their size and shape, ensuring stable, horizontal transport without the contents moving or tipping over. When not in use, the bag can be folded flat and secured with the elastic
rubber band on the
handle, resulting in a compact storage size of approximately 12 cm long, 14 cm wide, and 6 cm thick. "Reference Photo 1 showing the state where the hooks are partially closed" and "Reference Photo 2 showing the state where the hooks are partially closed" show the state where the hooks are fastened in two places on the front and back (hooks A1 and A2, hooks B1 and B2) and two places on each of the left and right sides (hooks D1 and D2, hooks E1 and E2, hooks G1 and G2, hooks H1 and H2) to fit the shape of the flat lunch box placed inside. The hooks can be fastened in a way that holds the contents most stably depending on the shape of the contents. For example, even if the contents are not flat, the contents can be carried stably by fastening two hooks on the left side and one on the right side.