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ive tried quite a few, including the latest low rider cambelbak skyline, which was supposedly made to alievate my exact problem (I think)...however it does, it is comfy per se, but I still get lower back pain, to prove its the backpacks, I wear a hip bum bag (fanny pack as our transatlantic cousins say) and I get no pain at all) with a water bottle on the frame, for night rides and winter rides when I don't drink as much
however soon as I put my big back pack on I get pain, circa 2ltr water and ONLY the tools I carry in my bum bag
so are there any bags out there less prone? or is a weak back causing it?
ive ended up just taking ibuprofen before a big ride on the weekend just to alleviate it for a few hours
If this is easy for you then it's probably not lack of strength: