1. Ordinary Bag (Vacuum Bag) Capable of withstanding a certain degree of vacuum, it has good freshness preservation functions. Mainly used for packaging dry goods with low freshness requirements, such as biscuits, peanuts, candies, etc. These packaging materials are not resistant to boiling or steaming. 2. Boiling Bag Vacuum resistant, can withstand water temperatures of 100 to 120 degrees Celsius for boiling. Mainly used for packaging food that requires boiling, such as various cooked dishes, chicken feet, and foods with soup. 3. High-Temperature Steaming Bag Vacuum resistant, can withstand high temperatures of 120 to 135 degrees Celsius for steaming. Mainly used for packaging products that require high-temperature sterilization and disinfection, such as various instant foods. 4. Multi-layer Co-extruded Paper-Plastic Composite Bag Mainly used for packaging perishable foods with lower strength and freshness requirements and shorter storage periods, commonly used for products such as milk, soy sauce, and vinegar. For example: multi-layer paper-plastic composite bags: PET/CPP (or OPP with aluminum coating, aluminum foil)/PE (or CPP, OPP)/Nylon/OPP (or OPP with aluminum coating, aluminum foil)/PE (or CPP, OPP). These paper-plastic composite bags are often used for products with higher freshness and temperature resistance requirements.