Multilayer method: the addition of the plastic film was the initial step to generate brick containers impermeable to liquids and warmth-sealable. In the nineteen sixties, an aluminum foil started to be extra for the cardboard container to ensure far better defense and increase the shelf life of the packaged merchandise. https://wateringabletoppak.wordpress.com/2025/10/09/paper-water-bottles-and-gable-top-boxes-plastic-free-sustainable-packaging-by-gable-top-pak/