During World War II, which packaging innovation was specifically developed to help soldiers while creating a lasting post-war consumer product?

Throughout military history, governments and manufacturers had to convince citizens to support war efforts through their consumption habits. Product packaging played a crucial role in this persuasion, becoming powerful propaganda tools that shaped public opinion and consumer behavior. This trivia question explores how packaging innovations during major conflicts helped mobilize civilian support through everyday purchases.

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M&M's candy shells that 'melt in your mouth, not in your hands,' designed to allow soldiers to carry chocolate in hot climates without melting
Campbell's condensed soup cans, created to efficiently ship nutrients to frontline troops while using minimal metal resources
Coca-Cola's aluminum bottles, developed to be lightweight for air drops while protecting against shrapnel damage
Spam's pull-tab tin design, engineered for quick access in combat situations while preventing battlefield contamination