Which military-developed packaging innovation from WWII revolutionized civilian retail and is now used in approximately 80% of prepared foods?

Throughout military history, product packaging has played a critical yet often overlooked role. From K-rations to MREs, packaging innovations developed for wartime have frequently transitioned into civilian retail applications. This trivia question explores how one packaging technology, originally designed for battlefield use, revolutionized consumer goods packaging worldwide. Test your knowledge about the intersection of military necessity and retail packaging evolution!

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Freeze-drying technology
Retort pouches (flexible, heat-resistant packaging)
Vacuum packaging
Aseptic packaging (Tetra Pak system)