Multilayer technique: the addition of a plastic film was the first step to produce brick containers impermeable to liquids and heat-sealable. Within the sixties, an aluminum foil began to be additional to the cardboard container to make sure much better protection and extend the shelf lifetime of the packaged solution. https://gabletopcarton.blogspot.com/2025/02/gable-top-carton-eco-friendly-packaging.html