Which packaging innovation from the 1960s revolutionized retail by allowing products to be displayed hanging on pegs rather than stacked on shelves?

Product packaging has evolved dramatically throughout history, often reflecting technological advances, cultural shifts, and changing consumer needs. Some packaging innovations fundamentally changed retail history and consumer behavior patterns. This trivia question explores a pivotal moment in packaging history that transformed how products were marketed, sold, and consumed - with significant implications that still influence modern retail strategies.

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Blister packaging (plastic bubble attached to cardboard backing)
Tetrapak cartons (aseptic packaging for liquids)
Aerosol spray cans with plastic caps
Shrink-wrapped multipacks