The starch bag has air holes to prevent children from choking their heads. The food packaging bag has no holes and there is air inside. After long-term shipping, water vapor will be generated inside them, which will make the products inside damp and moldy. There is no need to punch holes in the food packaging bag. In order to release the air in the bag after sealing, the air is prevented from occupying the space and punching to deflate. The air hole is in the bag body, and a round hole or butterfly hole is punched at the top of the bag, which is a hanging hole.