Multilayer program: the addition of a plastic film was the first step to produce brick containers impermeable to liquids and heat-sealable. In the sixties, an aluminum foil started to be added to the cardboard container to be sure far better protection and prolong the shelf life of the packaged product. https://wateringabletoppak.wordpress.com/2025/08/10/gable-top-carton-advantages-is-in-beverage-and-personal-care-product/