During World War II, which packaging innovation was specifically designed to boost soldier morale and later became a civilian retail success?

Throughout military history, the packaging of war-related products has evolved significantly - from ration tins to ammunition boxes. These packaging designs not only served practical purposes but also became powerful psychological and propaganda tools. This poll tests your knowledge about how military product packaging has influenced consumer behavior and public perception during major conflicts. Test your understanding of this fascinating intersection between military history and product presentation!

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M&M candies in cardboard tubes, designed to prevent chocolate from melting in tropical climates
K-ration boxes with waterproof wax coating that soldiers could repurpose as fire starters
Coca-Cola in specially designed green bottles that mimicked military canteens
Zippo lighters in steel cases with regimental crests that doubled as identification tags