Which military-developed packaging innovation from WWII revolutionized post-war retail by enabling longer shelf life and reducing waste?

The military sector has pioneered many retail innovations that later became civilian standards. During World War II, packaging innovations were critical for supplying troops worldwide under extreme conditions. One particular development revolutionized both military logistics and post-war retail. Test your knowledge of how wartime necessity led to packaging innovations that changed the retail landscape forever!

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Vacuum-sealed packaging (K-ration technology)
Corrugated cardboard containers (V-boxes)
Waxed paper wrapping (M-seal technology)
Aluminum foil preservation (P-wrap system)