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When I started the History of Gear Playlist I intended to only show major developments in Camping Gear of the 20th Century and the Duluth Pack was patented in 1882. But I've reconsidered as the Duluth Pack design, especially the Tumpline attachment, was popular for the first third of the 20th Century and does deserve a place. I also discovered a little know aspect of the original patent that never made it to the final production models, but is important to backpackers today.