* Eat healthier with your own bento lunchbox prepared at home * Keep your bento cool and safe with this innovative "ice pack lid" * Microwave and Dishwasher Safe (except lid) * This type has a dome-shaped inside of the lid, so it keeps even voluminous food from being crushed * Bento boxes utilising Hokkaido University's innovative technology, integrating ice packs into their lids. * BPA and Led Free A highly functional lunch box that functions as a cooling agent when frozen by sealing an ice pack inside the lid. After filling it with food, just place the lid, which has been frozen overnight in a household refrigerator, in place. By freezing the lid and using it, the lid itself acts as a cooling agent, so you can carry it around safely even on warm days. Estimated cooling effect (below 15): When chilled food (5) is placed in the refrigerator, it will last for about 4 hours at an outside temperature of 25. Use: Freeze overnight in a regular freezer. In the morning, fill it