Recently, two companies in Japan jointly developed a packaging bag that can be used exclusively for cooking. This kind of packaging bag has two layers, the outer layer is nylon with strong heat resistance, the inner layer is vinyl film, and the water level line that discharges water according to the amount of rice is also printed in the bag. In use, as long as the rice into the bag and add water to the corresponding water level line, and then put the bag into the pot and cook for 20 minutes, the rice can be eaten in a pot, this special packaging bag is convenient and hygienic, for the field use It is also very convenient.