Which packaging innovation from the 1960s dramatically changed retail by allowing consumers to see products before purchase while protecting contents and extending shelf life?

Product packaging has evolved dramatically throughout history, transforming both consumer behavior and retail strategies. From simple protective wrappings to sophisticated marketing tools, packaging innovations have shaped commerce in profound ways. This trivia question explores a pivotal moment in packaging history that revolutionized how products were sold and consumed, creating ripple effects that continue to influence modern retail practices.

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Blister packaging (transparent plastic sealed to cardboard backing)
Tin canning with pull-tab lids
Wax-coated cardboard milk cartons
Styrofoam peanut void fill