Multilayer system: the addition of a plastic film was the initial step to create brick containers impermeable to liquids and warmth-sealable. From the nineteen sixties, an aluminum foil began to be additional for the cardboard container to make sure better security and lengthen the shelf life of the packaged products. https://customgabletopcarton.blogspot.com/2025/02/gable-top-milk-revolutionary-packaging.html