Which packaging innovation from the 1960s revolutionized the beverage industry by allowing drinks to be stacked more efficiently and opened without separate tools?

Product packaging has evolved dramatically over centuries, not just protecting goods but also revolutionizing entire industries. Some packaging innovations were so groundbreaking they changed how products were distributed, preserved, and consumed worldwide. This trivia question focuses on a packaging breakthrough that transformed its industry and had far-reaching effects on global commerce and consumer behavior.

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The ring-pull aluminum can with the pull-tab opener
The Tetra Pak aseptic carton for milk and juice
The PET plastic bottle with screw-top lid
The aerosol spray can with pressure release valve