Multilayer technique: the addition of a plastic film was the initial step to make brick containers impermeable to liquids and heat-sealable. During the 1960s, an aluminum foil started to be added towards the cardboard container to make certain better protection and extend the shelf lifetime of the packaged item. Using https://medium.com/@GableTopPackaging/the-rise-of-gable-top-packaging-in-sustainable-solutions-1837c32d0522