Which World War II-era packaging innovation was originally developed for military use but became a massive retail success after the war?

During World War II, product packaging underwent significant transformations as companies adapted to material shortages and military needs. These innovations forever changed retail packaging and influenced modern design principles. Some wartime packaging solutions became iconic symbols of the era while others led to lasting commercial applications after the conflict ended. Test your knowledge about how military necessities transformed product packaging during one of history's most challenging periods.

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Aerosol spray cans (developed to combat malaria-carrying insects for soldiers in the Pacific)
Plastic wrap (developed as waterproof covering for military equipment)
Aluminum foil (developed as radar countermeasure material)
Freeze-dried coffee (developed as lightweight rations for paratroopers)