This lunch box is made from ancient Tosa cedar from Kochi Prefecture that is over 100 years old. Its greatest feature is that the wood absorbs excess moisture, allowing you to enjoy delicious rice. It comes with an insulated lid, which can be used depending on the season or occasion, and an inner lid to prevent leakage, making it a highly functional product. This is a product we would recommend to anyone who wants a wooden lunch box but is unsure which one to get.