Am I the only one that their back pack kills their shoulder during fall cleanups? I use a EBZ8500 and after about 45 minutes my left arm gets so numb that I can't move it. (Why the left I have no idea.) I tried extra strap padding made by somebody last year but it was more trouble because it didn't stay on the straps and didn't work. I wonder, does anybody make a waist belt that would take some of the weight off the straps?