Multilayer system: the addition of a plastic film was step one to produce brick containers impermeable to liquids and heat-sealable. From the nineteen sixties, an aluminum foil started to be additional to the cardboard container to make certain far better defense and extend the shelf lifetime of the packaged item. https://gabletop.finance.blog/2025/08/26/water-in-carton-eco-friendly-packaging-with-gable-top-pak/