In the 1950s, which packaging innovation revolutionized retail by allowing consumers to see products before purchase and dramatically reducing labor costs for stores?

Product packaging has evolved dramatically throughout retail history, with certain innovations revolutionizing how goods were sold, preserved, and marketed. One particular packaging invention in the 20th century transformed the consumer experience and retail landscape forever. Test your knowledge about this pivotal moment in retail and packaging history!

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Blister packaging (transparent plastic sealed to cardboard backing)
Self-service cellophane packaging
Tetrapak cartons (for liquids)
Vacuum-sealed tin containers