Which packaging innovation was first widely implemented in the US Army's K-Rations during WWII, revolutionizing field nutrition and later influencing civilian food packaging?

During World War II, packaging innovations revolutionized how soldiers received nutrition on the battlefield. One particular development changed military logistics forever, influencing commercial food packaging for decades afterward. This poll tests your knowledge of military product development history and how packaging innovations transformed warfare capabilities. Do you know which groundbreaking packaging technique made combat rations more effective during WWII?

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Waterproof waxed paperboard boxes with cellophane inner wrapping
Self-heating aluminum containers with pull-tab openings
Vacuum-sealed glass jars with rubber gasket seals
Freeze-dried food in pressurized metal canisters