Multilayer program: the addition of a plastic film was the initial step to help make brick containers impermeable to liquids and warmth-sealable. From the nineteen sixties, an aluminum foil started to be added to the cardboard container to ensure better security and prolong the shelf life of the packaged product. https://waterinsustainablepak.news.blog/2025/04/09/how-gable-top-packaging-is-shaping-the-future-of-consumer-goods/