The inner layer adjacent to the food in retort pouches and autoclavable aluminum containers is made of multi-layer, impermeable polypropylene films that are resistant to autoclaving heat. These films also exhibit excellent chemical resistance to all types of acids, bases, and fats, effectively preserving the quality, taste, freshness, and original texture of the food over many years of shelf life. Due to their superior properties and practical advantages over traditional metal cans, these bags and containers can market a wide range of seafood, meat, vegetables, and other food items in various capacities, featuring exclusive and attractive designs. Autoclavable bags allow printing in up to eight colors, enhancing the product's presentation and appeal.