Retort pouches are made from a laminate of flexible plastic and metal foils. They can withstand thermal processing during food sterilization. Retort pouches can be retorted up to 135°C. They have a self-venting function for microwave use.

Advantages of retort pouches include easy disposal and transportation. They are flexible and have a high barrier that retains flavor and prevents oxidation. The lamination structure of retort pouches prevents gas permeation.

The type of lamination and barrier properties vary based on the product and acidity/alkaline level.

Examples of materials used in retort pouches include polyester (PET), nylon, aluminum (Al), food-grade cast polypropylene (CPP), and polyethylene (PE).