Which product packaging innovation, now ubiquitous in retail, was first widely adopted by the U.S. military in 1944 to efficiently distribute supplies to troops?

During World War II, military supply chains transformed retail concepts that we still use today. One significant innovation was the PX (Post Exchange) system, which revolutionized how products were packaged, distributed, and sold to troops in various combat theaters. This poll tests your knowledge about a particular packaging innovation that emerged from military retail necessity and later became standard in civilian markets worldwide.

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Vacuum-sealed packaging for food preservation
Standardized cardboard boxes with interlocking tabs
Aerosol spray cans for insecticides and lubricants
Plastic shrink-wrap for bundling multiple items