To understand the characteristics of one's own products, and then choose the packaging bag materials that match one's own products, the main food packaging materials on the market are PE, PET, PA and so on.For example, vacuum bags (also known as nylon bags) are favored by many food companies because of their good vacuum effect, high transparency, good sealing, good moisture-proof performance, and not easy to age.Another example is aluminum foil bags (also known as pure aluminum bags), which have the characteristics of strong air barrier properties, oxidation resistance, waterproof, moisture-proof, non-toxic and odorless, and meet the hygiene standards of food and pharmaceutical packaging. In addition, they have the characteristics of high temperature resistance and low temperature resistance. Aluminum foil bags can be considered when choosing packaging bags for some foods that have been cooked at high temperature.