Most of you say that you carry your bags on the side of the hand that you use. The weird thing for me is that I'm right handed but I've always carried any and all bags on my left shoulder. I've tried wearing bags on my right shoulder and it just felt really weird!
I'm the same! Am right-handed and carry my shoulder bags on my left shoulder. And even stranger, thinking about it, I only use my right hand/arm to carry my hand-held bags. Weird!

There must be a reason/theory here somewhere!