Which packaging innovation was directly developed from military needs during WWII and later revolutionized civilian food preservation?

During World War II, product packaging underwent a dramatic transformation as manufacturers adapted to material shortages and military needs. This evolution changed consumer packaging forever and created enduring innovations. Test your knowledge about how wartime necessity sparked packaging revolutions that transformed civilian products during and after the conflict, creating some of history's most memorable military-inspired retail products and packaging techniques.

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Aerosol spray cans (originally developed for insecticide delivery to soldiers in the Pacific)
Aluminum foil (originally developed as chaff to confuse enemy radar)
Vacuum-sealed glass jars (originally for medical supplies in desert conditions)
Cellophane wrap (originally developed for gas mask filters)