Multilayer Method: the addition of a plastic film was the first step to produce brick containers impermeable to liquids and heat-sealable. In the nineteen sixties, an aluminum foil started to be extra towards the cardboard container to be certain superior defense and increase the shelf life of the packaged product. https://paperbottle.fashion.blog/2025/06/09/redefining-responsibility-gable-top-containers-lead-the-eco-packaging-evolution/