Cooler bags are a kind of bags for refrigerating and preserving vegetables, fruits, foods, and other chemicals, perishable products, biological agents, and all products that need to be transported in a cold environment, so as to prevent them from deteriorating in places where there is no cold source. It is a good choice for picnickers, which can be used to refrigerate fresh vegetables, fruits, beer, beverages, food, etc in a short time.