Which of these packaging innovations was specifically developed for D-Day operations in 1944 but later became a massive commercial success in civilian markets?

During World War II, packaging innovations played a crucial role in military logistics and morale. Some products created specifically for troops became iconic and continued as consumer favorites long after the war ended. This poll tests your knowledge of how innovative packaging for military use transformed into successful civilian product strategies. How well do you know the intersection of military necessity and product development?

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K-rations in waterproof Cellophane wrappers
SPAM in key-opened tin containers
M&M's candy in moisture-resistant tubes
Zippo lighters in windproof metal cases