Which packaging innovation, first widely deployed during World War I, revolutionized military rations by allowing troops to receive hot meals near the front lines?

Throughout military history, the packaging of rations has evolved significantly to meet the needs of troops in various combat conditions. From the American Civil War hardtack boxes to modern MREs (Meals Ready to Eat), packaging innovation has played a crucial role in military logistics, troop morale, and combat effectiveness. This poll tests your knowledge about a fascinating turning point in military ration packaging that changed how armies were sustained in the field.

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Airtight tin cans with self-heating chemical packets
Insulated Lister bags for clean water distribution
The Marmite jar, introduced to combat B vitamin deficiency
The haybox cooker, an insulated container that kept food hot for hours after initial cooking