A French company recently developed a frozen food cooler bag. The appearance of the cooler bag is similar to that of commodity or supermarket-provided plastic bags and paper bags, but it is thicker. The bag is divided into two layers, the outer layer is a general plastic and thick paper, and the inner layer is an insulating layer made of nylon fiber. The seal above the merchandise bag is tighter and the principle is similar to the heat preservation water bottle. The holding time is 2 hours, 3 hours, and 4 hours, and different temperatures such as 0cC, -4°C, and 10°C can be maintained. There are also hand-held travel bags that can hold more than 10 kilograms of frozen food for a longer period of time. Frozen food cooler bags provide consumers with great convenience and are very beneficial for selling frozen or frozen foods in supermarkets.