Which military packaging innovation was widely credited with helping Allied forces during WWII by significantly extending the shelf life of field rations?

Throughout military history, packaging design has played a crucial role in preserving supplies and equipment for troops in the field. From ancient armies to modern special forces, the evolution of military packaging has directly impacted battlefield effectiveness and soldier survival. This poll tests your knowledge about a revolutionary packaging innovation that changed military logistics during one of history's most significant conflicts.

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

K-Ration waxed cardboard boxes designed by Dr. Ancel Keys
SPAM's key-opened tin can design that prevented contamination
The DUKW amphibious vehicle's waterproof storage compartments
The Dehydrated and Vacuum-Sealed packaging system pioneered by the Quartermaster Corps