Which military packaging innovation, originally designed to preserve combat rations in extreme conditions, was later adapted for mainstream retail food preservation?

Many product innovations we take for granted in modern retail actually originated from military research and development. From packaging technologies that keep products fresh to logistics systems that ensure efficient delivery, military advancements have significantly influenced how products are developed, packaged, and sold today. Test your knowledge about these military-to-retail crossover innovations that have revolutionized the consumer marketplace.

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Retort pouch (flexible packaging that can withstand thermal processing)
Vacuum-sealed glass containers (Mason jar technology)
Waxed cardboard boxes (waterproof packaging)
Aluminum pull-tab cans (easy-open technology)