This is a food container made in collaboration between RIZAP and Skater, and it's dishwasher safe. You can freeze food directly in it, and it seems you can defrost it in the microwave with the lid on. I received it as a gift, but I haven't had much use for it, so I'm selling it. 【Size】 Approximately 15.9 x 12.6 x 6.4 cm 【Weight】Approximately 115g 【Capacity】Approximately 550ml ❇︎I am also selling the L size. Please see the other page. The following is an explanation borrowed from the internet. Please refer to the internet for more details. Product Details 〇Supervised by RIZAP RIZAP x Skater food storage container. This is a collaborative product supervised by RIZAP. It's lightweight and easy to use, and you can put pre-made dishes in it, or use it as a lunch box because it has a divider. About 1.8 bowls of rice (approx. 200ml per bowl) can fit in 1/2 of the container. 〇Also as a microwave cooker You can put it in the microwave with the lid on, and it can also be used as a microwave cooker. It can withstand freezing to -20℃ and defrosting/heating to +140℃*1. It is also dishwasher safe.