France has developed frozen food insulation bags

The French-developed insulated frozen food bags have the same appearance as plastic bags and paper bags provided by goods or supermarkets, but they are 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 2h, 3h, 4h, and there are different temperatures such as 0°C, -4°C, and 10°C. There is also a portable travel bag type, which can hold 10kg of frozen food for longer holding time.