Which WWII-era packaging innovation was specifically designed for military use but later revolutionized civilian food preservation?

During World War II, product packaging and brand innovation became critical to military logistics and morale. Companies adapted their packaging for battlefield conditions while creating enduring brand stories that still resonate today. This poll tests your knowledge of how product design evolved during wartime to meet military needs, creating innovations that later transformed civilian markets.

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K-ration waxed paperboard boxes that later inspired cereal packaging
SPAM's key-opened tin design that became standard for commercial canned meats
The P-38 pocket can opener that required no electricity or moving parts
Dehydrated instant coffee packets developed by Nestlé (later branded as Nescafé) for military rations