Multilayer program: the addition of the plastic film was step one to help make brick containers impermeable to liquids and warmth-sealable. From the sixties, an aluminum foil started to be extra into the cardboard container to make sure much better protection and extend the shelf life of the packaged solution. https://gabletop.finance.blog/2025/05/05/innovative-packaging-solutions-for-dairy-products-brand-identity-with-gable-top-cartons/