Which food packaging innovation, developed for military use in World War I, later revolutionized civilian food retail and is still widely used today?

During World War I, military supply logistics underwent dramatic changes that influenced modern product packaging forever. As armies needed to supply millions of soldiers across vast distances, new packaging solutions emerged that would later transform civilian retail. This poll tests your knowledge about a revolutionary military packaging innovation that changed both warfare and later commercial product distribution.

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Tin cans with key openers
Self-heating meal containers
Kraft paperboard cartons
Vacuum-sealed glass jars