Which military surplus product became a massive post-WWII retail success when a surplus store owner repurposed and marketed it as the first mass-produced camping backpack?

The military has driven many innovations that later became commercial successes. From early survival equipment to cutting-edge technology, military retail products have often transitioned to civilian markets with remarkable success stories. This poll tests your knowledge about one of the most significant military-to-civilian retail transitions that revolutionized an entire industry and changed outdoor recreation forever.

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M-1945 Field Pack
M-1910 Haversack
M-1928 Knapsack
M-1936 Musette Bag