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@Buffalo_Bill
I used a shoulder bag for 14 years as a messenger, and there were times when it hurt me, but I never suffered any upper or lower back problems. I used only single straps and rarely bothered with cross-strapping.
In my view, these types of problems are rarely to do with weight carried externally, more likely to do with muscle imbalances, leading to distortions of posture. Is cycling your only form of exercise? Do you stretch? Have you considered yoga or some other sort of complementary activity?