Which military packaging innovation from WWII revolutionized civilian retail after the war, becoming a cornerstone of modern product packaging?

Throughout history, military innovations have often made their way into civilian retail markets, transforming how products are packaged, distributed, and sold. From preserved rations to GPS technology, military necessity has driven retail innovation. This trivia question focuses on how a specific wartime packaging innovation revolutionized civilian retail after World War II.

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Aerosol spray cans (developed for insect repellent delivery to troops)
Vacuum-sealed pouches (developed for battlefield medical supplies)
Corrugated cardboard containers (developed for airdropped supplies)
Waterproof waxed cartons (developed for amphibious landing operations)