Ryobi An Koban Bento (Small) Size: 175 x 100 x 65 Capacity: 480ml Weight: 117g The appearance doesn't differ much from the medium size. The medium size has a capacity of 560ml. Because it has a lid that overlaps, you can adjust the amount you put in. It has a urethane coating, so it's easy to care for, but it still functions as a proper bentwood lunch box.