Which revolutionary product packaging innovation was developed during World War II that transformed military logistics and later became a staple in civilian retail?

Throughout military history, product development and innovation have played crucial roles in warfare outcomes. From revolutionary packaging designs that preserved rations for troops to retail innovations that transformed how military supplies were distributed, the business side of warfare has been as important as tactics. This trivia challenges your knowledge about a fascinating intersection of military history and product development that changed how armies operated in the field.

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K-rations in waterproof waxed cardboard boxes
Aerosol spray cans for insecticides and medical supplies
Vacuum-sealed metal tins for food preservation
Self-heating meal containers with chemical heating elements