Which packaging innovation, first commercially introduced in the 1950s, revolutionized retail by allowing consumers to see products before purchase while extending shelf life?

The history of retail is filled with groundbreaking packaging innovations that transformed how products are marketed, preserved, and consumed. One particular packaging breakthrough in the 20th century revolutionized the consumer goods industry by dramatically extending product shelf life while reducing costs. This innovation changed shopping habits, enabled new distribution models, and remains ubiquitous in modern retail. Test your knowledge of this pivotal development in product packaging history!

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Blister packaging (plastic bubble attached to cardboard backing)
Vacuum-sealed flexible packaging (retort pouches)
Clear polyethylene terephthalate (PET) bottles
Transparent shrink wrap/film packaging