Which iconic product's packaging changed from metal to cardboard during WWII, with the company encouraging consumers to send the metal containers to the military for ammunition production?

During World War II, military requirements drastically changed product packaging across consumer industries. Companies had to innovate with limited materials while maintaining brand recognition and product integrity. These wartime adaptations not only helped the war effort but also sparked innovations that influenced packaging design for decades to come. Test your knowledge about how military history intersected with product packaging during one of history's most resource-constrained periods.

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Coca-Cola bottles
M&M's candies
Campbell's soup cans
Kellogg's cereal boxes