Which packaging innovation from the 1950s revolutionized retail by allowing consumers to see products before purchase while providing superior preservation?

In the history of retail, packaging innovations have dramatically transformed how products are sold, preserved, and perceived by consumers. Some packaging breakthroughs have been so significant that they've altered entire industries and consumer behaviors. This trivia question focuses on a revolutionary packaging development that changed retail history and created new possibilities for product distribution and marketing. Test your knowledge of this pivotal moment in retail evolution!

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Blister packaging (plastic bubbles attached to cardboard)
Vacuum-sealed tin cans with pull-tabs
Clear polyethylene terephthalate (PET) bottles
Wax-coated paperboard cartons