Which packaging innovation was originally developed for military use before revolutionizing the consumer food industry?

Product packaging has transformed how we consume, store, and preserve food throughout history. Behind every food package is a story of innovation, problem-solving, and sometimes accidental discoveries. This trivia question explores a significant packaging breakthrough that revolutionized how certain foods reach consumers. Test your knowledge about the intersection of food science, packaging technology, and culinary history!

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Retort pouches (flexible packaging that can withstand high-temperature sterilization)
Vacuum-sealed glass jars (home canning method)
Paperboard cartons with polyethylene coating (milk and juice containers)
Biodegradable corn-based plastic containers (eco-friendly food storage)