The material of the commercially available insulated lunch bag is mostly plastic. We designed this special insulated lunch bag for the insulated lunch box, which is made of cotton linen and cotton and double-layer tin foil heat-dissipating layer (commercial insulated bag is single-layer tin foil). However, the whole is to help the convenience of the box with a layer of quilt plus the concept of heat. Different from the general commercial insulated lunch bag, this bag has a layer of lining and wraps the foil cloth inside. It can also be used as a carry-on bag. The beam port method is the most convenient to use, suitable for primary school students, and the beam mouth design is convenient for children to open or tighten. / Size / Internal space about 25cmx15cmx height 18cm (excluding the height of the beam), the length of the strap is 36cm In order to prevent the insulation tank from falling over, there is a intimate tie design, and the strap can be fixed up to a 9~12cm thermal insulation tank. / Material / In the material selection, we hope that the less the material of the bag, the better the plastic, so the following materials are used: 100% cotton and linen cloth, polyester cotton cotton, double tin foil bubble cloth, cotton blended cloth , cotton blended handle, wax rope, cord buckle / Use and maintenance methods / Please wash by hand, machine wash has the risk of deformation.