Which packaging innovation was specifically developed for the U.S. Army's K-Rations in WWII that later influenced civilian food packaging?

The logistics of feeding troops has been a critical aspect of military history. During World War II, one particular innovation revolutionized how soldiers were supplied with nutrition in the field. This product development challenge combined nutrition science with practical packaging considerations that would influence military and civilian food packaging for decades to come. Test your knowledge about this significant military product innovation!

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Waxed cardboard boxes that could withstand extreme temperatures and moisture
Individual cellophane wrappers that preserved food freshness and prevented contamination
Aluminum cans with pull-tab openings that required no tools to access
Vacuum-sealed glass containers that prevented spoilage for up to three years