Sizes: (Left) 31.0cm (length) x 19.4cm (width) x 10.8cm (height) 3.6L (Middle) 31.0cm (length) x 19.4cm (width) x 5.4cm (height) 1.4L (Right, 2 pieces) 19.4cm (length) x 14.6cm (width) x 10.8cm (height) 1.5L You can heat it in the microwave with the air valve on the lid open, and you can also store it as is. I bought this new, unused item in the US for 6000 yen. It seems to be a larger size that is not available in Japan. I washed it with water intending to use it, but I kept it at home without using it. I think I might have used the smallest one once. There might be some minor scratches from being stored at home, but I think they are all in good condition. Instant purchase is welcome. The person who purchases first will be given priority, even if there are comments. This is a used item. Please refrain from purchasing if you are sensitive to imperfections. *This is a home-stored item. Please feel free to comment if you have any questions. I may be slow to respond because I have children. Due to amateur photography, there may be slight differences in color and texture. Returns and refunds are not accepted. Please understand that this is a used item. Please understand that I will use recycled materials and newspapers for packaging.