Which innovative packaging technology was developed during WWII for military use and later revolutionized civilian food preservation?

During World War II, military needs drastically influenced product packaging across industries. From K-rations to medical supplies, the demands of war created packaging innovations that continue to impact product design today. This trivia question explores how one specific packaging technology, developed initially for military applications, revolutionized civilian consumer goods in the post-war era. Test your knowledge of how military history has shaped the everyday products we use!

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Freeze-drying (lyophilization) technology
Tetrapak aseptic packaging
Blister packs with aluminum foil backing
Aerosol spray cans with propellants