In the 1980's climbers pooped in a paper bag which was then tossed, with the idea to return to the base and pick it up, but often that did not happen. As climbers on El Capitan increased, it was clear that a new solution was required. Building a PVC tube that was streamlined for hauling but could contain the toxic sludge for later disposal provided a solution. First poop in a paper bag, then put into the plastic bag lined PVC tube.
John Middendorf published the first article in Climbing Magazine on the importance of packing poop up the walls around 1995 with the illustration above decribing how to make a poop tube.
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