Which packaging innovation revolutionized military field rations during World War II and fundamentally changed how soldiers were supplied in combat zones?

Throughout military history, the packaging of food rations has been critical to troop effectiveness in the field. From ancient times to modern conflicts, armies have continuously innovated ways to deliver nutrition to soldiers in challenging combat environments. This trivia question explores a significant packaging innovation that changed how militaries approached field feeding during a pivotal period of warfare.

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The K-Ration's waxed paperboard boxes with waterproof cellophane inner wrapping
The Napoleon-era tinned meat canisters with lead soldering
The Civil War hardtack wooden crates with tar sealing
The Roman legion's clay amphora preservation system