Which WWII-era military product packaging innovation was initially developed for weapons but later revolutionized civilian food preservation after the war?

During World War II, product packaging underwent revolutionary changes to meet military needs and resource constraints. From K-rations to ammunition boxes, packaging innovations from this era later transformed civilian product design and marketing. Test your knowledge about a groundbreaking military packaging development that changed both warfare and post-war consumer products.

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M1942 Waterproof Ammunition Box design
Pressurized aerosol spray cans (originally for insecticide dispersal)
Vacuum-sealed K-ration wrappers
Bakelite container systems for medical supplies