Which packaging innovation was developed during WWII specifically for military use but later revolutionized civilian food preservation?

Throughout military history, packaging innovations have played a crucial role in preserving supplies, ammunition, and equipment for soldiers in the field. From ancient methods of preserving rations to modern-day MREs (Meals Ready to Eat), military packaging has evolved dramatically to meet battlefield demands. This trivia tests your knowledge about a revolutionary WWII-era packaging innovation that changed how supplies reached the front lines and influenced civilian packaging for decades to come.

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SPAM cans with key-wind openers
K-rations in waxed cardboard boxes
DUKW amphibious vehicle transport containers
DEPAL (Dehydrated Packaged Army Lunch) aluminum foil pouches