Cooler bag is also called passive refrigerator, a kind of bag with high heat insulation, constant temperature effect. It is warm in winter and cool in summer. It's made by high-quality materials, easy to carry, suitable for driving trips, holiday outings, family picnics. The inner layer of the lunch cooler bag is pearl composite aluminium foil reflective thermal insulation layer, providing good thermal insulation effect. The custom cooler bag is fashionable and beautiful in appearance, bright in color, novel in design, easy to clean, foldable and easy to store.