The inner layer is aluminum film to keep food fresh and warm. The intermediate material is thick soft foam, which can make the heat insulation effect better. The outer layer is Oxford fabric, which is durable, wear-resistant and tear-resistant design. Side pockets with button design. You can convert it into a square bag and carry it in your hand or shoulder bag. The inside of the bag compartment is completely sealed by the heat insulation layer, which can extend the heat preservation time and cold food preservation. 11 13/16" L x 6 11/16" W x 8 1/4"H