Multilayer Technique: the addition of a plastic film was the initial step to generate brick containers impermeable to liquids and heat-sealable. Within the nineteen sixties, an aluminum foil started to be included on the cardboard container to make certain greater defense and prolong the shelf lifetime of the packaged product. https://medium.com/@GableTopPackaging/the-rise-of-gable-top-cartons-in-packaging-e99807273cf8