Which packaging innovation was originally patented in 1930, but didn't become widely used in retail until the 1950s when it revolutionized product protection and display?

Product packaging has evolved dramatically over the centuries, with certain innovations fundamentally changing retail and consumer behavior. Some packaging inventions were so revolutionary that they transformed entire industries, altered supply chains, and even changed how we interact with products. This trivia question focuses on a landmark packaging innovation that had far-reaching effects beyond simply containing a product.

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Blister packaging (transparent plastic sealed to cardboard)
Tetrapak cartons (aseptic packaging for liquids)
Vacuum-sealed canning (for food preservation)
Aerosol spray cans (pressurized dispensing system)