Cooler Bags are a type of bag that is often used in daily life and outdoor picnics. For various fruits, drinks, and foods placed in the bag, they can maintain a certain temperature and freshness for a certain period of time, that is, they can be used to keep cold or warm. The cooling effect will be even better if it is matched with a refrigerant. The fabric can be a solid solid Oxford cloth, a printed Oxford cloth, or a waterproof fabric. The middle insulation layer generally has pearl cotton, sponge, high-density cotton, etc. Different insulation layers have different effects on cold and heat preservation. The higher the density and the thicker the thickness, the better the cold and heat preservation effect. The inside is generally made of PEVA and aluminum film. PEVA can be hot-pressed to prevent water leakage during use, making it easier and more convenient to wipe, and it meets food environmental protection grade.