Which packaging innovation was initially rejected by retailers because they feared it would reduce impulse purchases, but later revolutionized shopping by allowing customers to see products before buying?

Product packaging has evolved dramatically over the centuries, transforming from simple protective coverings to sophisticated marketing tools. Behind many of today's common packaging designs are fascinating invention stories that revolutionized retail and consumer behavior. This trivia question explores a groundbreaking packaging innovation that fundamentally altered how products are sold and consumed worldwide.

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Clear cellophane packaging (1912)
Tetrapak cartons (1951)
Aerosol spray cans (1941)
Resealable zip-lock bags (1968)