Which packaging innovation from the 1950s-60s fundamentally changed retail marketing by allowing products to be visually displayed while protected?

Throughout history, product packaging has evolved dramatically, not just as a protective measure but as a critical marketing tool. From ancient clay containers to today's sustainable solutions, packaging innovations have shaped consumer behavior and brand perception. This trivia focuses on a pivotal moment in packaging history that revolutionized retail and transformed how products were marketed and sold.

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Blister packaging (transparent plastic sealed to cardboard backing)
Tin containers with lithographed labels
Corrugated cardboard boxes with color printing
Waxed paper wrapping with brand stamps