Multilayer Program: the addition of the plastic film was the initial step for making brick containers impermeable to liquids and warmth-sealable. While in the 1960s, an aluminum foil started to be included to the cardboard container to guarantee much better protection and lengthen the shelf life of the packaged item. https://dairygabletoppackaging.finance.blog/2025/04/09/how-gable-top-packaging-is-shaping-the-future-of-consumer-goods/