Four sided sealed bag is a common packaging bag, usually used for packaging food, cosmetics, drugs and other items. Its feature is the sealing design on the four edges of the bag, which can effectively protect the items inside the bag from external pollution or damage. Four sided sealed bags are usually made of plastic material, which has the advantages of high transparency, wear resistance, and easy sealing. During the packaging process, the four edges of the bag can be heat sealed using a sealing machine to ensure the safety and hygiene of the items inside the bag.