Which packaging innovation from the 1950s revolutionized retail by allowing customers to see products before purchase and is credited with enabling the rise of self-service stores?

Throughout history, packaging design has not only protected products but also reflected societal changes, technological advances, and marketing evolution. From ancient clay vessels to today's smart packaging, the history of product containers tells the story of human innovation and commerce. This trivia question focuses on a pivotal moment in packaging design history that fundamentally changed retail and consumer behavior in the 20th century.

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Blister packaging (clear plastic sealed to cardboard backing)
Aluminum beverage cans with pull tabs
Tetrapak aseptic cartons for liquids
Aerosol spray cans with propellant technology