Transparent retort bags are made from a variety of materials, commonly including polyester (PET), nylon (PA), and polyethylene (PE). These materials possess different physical and chemical properties, such as high-temperature resistance, puncture resistance, and tensile strength. Combinations of these materials can meet the needs of various food packaging applications. For example, PET has excellent high-temperature resistance, making it suitable for food packaging requiring high-temperature retorting; while PA material offers good puncture resistance, protecting the food inside from external physical damage.