Which packaging innovation, originally developed for military use during WWII, revolutionized retail food preservation and is now found in virtually every grocery store?

During World War II, military necessities dramatically transformed consumer packaging in ways that still influence modern retail. From K-rations to vacuum-sealed foods, battlefield innovations led to revolutionary changes in how products were preserved, transported, and marketed to civilians after the war. This poll tests your knowledge of how military needs drove one of the most significant packaging innovations that changed retail history.

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Aerosol spray cans (developed to dispense insecticide for troops in the Pacific)
Freeze-dried food technology (developed for lightweight combat rations)
Vacuum-sealed packaging (developed to extend shelf life of combat rations)
Plastic wrap film (developed to waterproof ammunition and weapons)