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by LargoLasskhyfv 1519 days ago
From 11 months ago, my take on that:

https://news.ycombinator.com/item?id=27139705

Thinking about it now, I could see how it started on the shoulders, where the straps of my backpack are, and on my back. Basically everywhere where (different) backpack(s) and straps thereof applied load, pressure, friction.