Multilayer System: the addition of a plastic film was the first step to create brick containers impermeable to liquids and warmth-sealable. While in the sixties, an aluminum foil began to be added on the cardboard container to make certain greater protection and prolong the shelf life of the packaged product. https://topcartons.family.blog/2025/04/09/eco-conscious-innovation-with-water-in-carton-packaging/