I bought this at the beginning of this year. I think I've used it for about six months. I think there might be some transfer of odors or colors. Personally, it doesn't bother me much. If you are concerned, please bleach it, etc. The "Foodman" thin, upright lunch box, which is leak-resistant, is now antibacterial. It's A4 size and only 3.5cm thick, so you can carry it upright in your bag. The inside is sealed with a gasket, making it leak-resistant. 【The Secret to Carrying it Upright】 The gasket fixed to the inner lid prevents leaks. Even if you put it upright in your bag, your rice and side dishes won't mix. 【Easy-to-Wash Rounded Corners】 The gasket is fixed to the lid, so you don't need to remove it when washing. Furthermore, it's antibacterial, so it's safe. 【One-Plate Design】 The dividers are fixed, so you just need to fill it with rice and side dishes, making it easy to prepare your lunch. You can also heat it in the microwave if you remove the lid. 【Specifications】 ●Capacity: 800mL