Which packaging invention, patented in 1952, revolutionized retail by allowing consumers to see products before purchase and is credited with enabling the rise of self-service shopping?

Throughout history, packaging innovations have revolutionized how products are preserved, transported, and marketed. These discoveries have not only extended product shelf-life but transformed entire industries. This trivia question explores a groundbreaking packaging innovation that changed the retail landscape and consumer behavior. Test your knowledge of how packaging inventions have shaped our modern shopping experience!

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Blister packaging (transparent plastic sealed to cardboard backing)
Tetrapak aseptic cartons (paperboard, aluminum and polyethylene layers)
Aerosol spray cans with propellant technology
Vacuum-sealed metal food containers