Which packaging innovation from the 1950s revolutionized retail by allowing consumers to see products before purchase and is credited with enabling the self-service shopping model?

The history of product packaging reveals fascinating insights into the evolution of retail, consumer behavior, and marketing strategies. Throughout the centuries, innovations in packaging have not only preserved products but also revolutionized branding, consumer experiences, and purchasing decisions. This trivia question focuses on a pivotal moment in packaging history that fundamentally changed how products were sold and consumed.

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Cellophane and transparent plastic packaging
Tin cans with pull-tab openings
Cardboard boxes with illustrated product images
Vacuum-sealed glass containers