You need an insulation bag to buy lunch boxes, which can enhance the insulation effect. Lunch bag-refers to the most convenient bag to carry, usually refers to the bag with tableware, which can hold lunch boxes, cups and kettles. The main material of the product is high-density Oxford cloth, an environmentally-friendly fabric with high density, strong cold retention, portability, neither soft nor hard texture, and non-toxic, which is called environmental special material.