In Nanning Renrenle Supermarket and Wal-Mart Supermarket, food can be packed in vacuum. This vacuum compression bag is sold in Nanning Renrenle Supermarket and Wal-Mart Supermarket, both of which are equipped with air pumps. When food is placed in the air, various changes will occur (such as corruption, rancidity, discoloration, drying or moisture absorption, etc.). The environmental conditions that make it inedible have a lot to do with it. These environmental conditions mainly include oxygen concentration, humidity and pH value. As a composite flexible package for food, the primary function is to reduce the adverse effects of environmental factors on food and prevent food from deteriorating too quickly.