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@hippy
Numb forearm? Not shoulder? Could this be something to do with bike fit.. ie. too stretched out, locked arms taking all the bumps and pressure from your upper body. Kinda like arm pump when mtbing or something. I don't see how the back pack/crumpler would be causing forearm numbness.. well none of mine ever have. I'm using the same Crumpler for 4 years and before that backpacks for 1000 years.