During WWII, which packaging innovation was specifically developed to address battlefield needs and later revolutionized civilian food preservation?

Throughout military history, packaging design has played a crucial yet often overlooked role in warfare logistics. From preserving rations to protecting ammunition, innovative packaging solutions have directly impacted battlefield outcomes. This trivia question explores how packaging design evolved to address a specific military challenge during World War II, demonstrating how product packaging innovation can influence historical events.

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K-Ration waxed paperboard containers that evolved into modern frozen dinner trays
SPAM key-opened tin cans that introduced the concept of convenient ready-to-eat meat products
Vacuum-packed dehydrated foods in laminated foil pouches that became the basis for astronaut meals
Waterproof cellophane ammunition wrappers that later influenced plastic food packaging