"Eatable tableware / e-tray" is on sale at Village Vanguard Online. The price is 903 yen (tax included) for 10 pieces.
This is an eco-friendly tableware that you can eat. It has excellent water resistance and strength, and can be used as a container for about 30 minutes to 1 hour without any problems. The size is W178 x D117 x H30. Domestic.