Which packaging innovation from the 1950s revolutionized food retail by allowing consumers to see products before purchase and dramatically extending shelf life?

Throughout history, packaging innovations have dramatically changed how products reach consumers and influenced purchasing behaviors. One particular packaging development in the 20th century revolutionized the food industry, extended product shelf life, and fundamentally changed shopping habits. Test your knowledge of this pivotal moment in retail and packaging history!

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Vacuum-sealed tin cans
Clear cellophane wrap
Transparent polyethylene packaging
Wax-coated cardboard containers