Which innovative product packaging design was first introduced during WWII that revolutionized how U.S. soldiers received their field rations?

Throughout military history, the packaging and design of combat rations has been crucial for troop morale and effectiveness. From the ancient Roman 'bucellatum' hardtack to modern MREs (Meals Ready to Eat), military food packaging has evolved dramatically to address field conditions, nutrition needs, and technological innovations. This poll tests your knowledge about a significant innovation in military food product packaging that changed how soldiers ate during combat operations.

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C-Ration cans with attached P-38 can openers
Self-heating aluminum pouches
Vacuum-sealed plastic trays with tear-strip openings
Freeze-dried meals in waterproof packaging