* 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) * Double Bento so you can bring * Bento boxes utilising Hokkaido University's innovative technology, integrating ice packs into their lids. * BPA and Led Free This model has two large size lunch boxes stacked on top of each other. You can also use it with just one layer by reversing the direction of the rubber band. Both the upper and lower tiers have cold storage lids, but you can also use the lower tier by removing the cold storage lid. 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