Foldable lunch box Convenient for carrying around. You can use it with plastic wrap or foil for not only rice balls and sandwiches but also for items that you don't have to worry about water droplets. Also, as a box for small items!! I used it several times a long time ago for sports days and picnics. Made of polypropylene. Size: Assembled: Approximately 9.2 x 21 x 6 cm Folded: Approximately 9.2 x 21 x 3 cm When folded, it feels like it floats a bit, so using a rubber band makes it about 1 cm high. Thank you for looking.