Multilayer system: the addition of a plastic movie was the initial step to make brick containers impermeable to liquids and warmth-sealable. In the 1960s, an aluminum foil began to be included into the cardboard container to ensure better protection and increase the shelf lifetime of the packaged product or service. https://leak-proofgabletopcarton.blogspot.com/2025/02/gable-cartons-future-of-packaging.html