Which packaging innovation from the 1950s revolutionized food retail by extending shelf life and allowing consumers to see products before purchase?

Throughout history, packaging innovations have revolutionized how products are stored, transported, and marketed to consumers. Some packaging breakthroughs have been so significant that they've transformed entire industries and changed consumer behaviors forever. This trivia question explores one such groundbreaking invention that had a profound impact on product freshness, accessibility, and retail strategy.

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Vacuum-sealed packaging
Clear polyethylene terephthalate (PET) containers
Resealable zip-lock technology
Transparent shrink wrap film