Another vote here for backpacks for beat up neck/back/shoulders. I ditched my old shoulder bag and got one of LA Police Gear's "Operator" backpacks.
Pros: Wears pretty comfy, good pockets layout, good handles, removable waist strap, colors other than black so your crap doesn't get sucked into the Bermuda triangle, sturdy material and lining, haven't had any stitching problems, side pockets big enough to hold water bottles, stands upright on it's own, cheap price/good value. I don't use the molle but it has enough to look like a X-mas tree.
Cons: Haven't had any to complain about. I pulled a pull string off a zipper but easy fix.