I'm no animator, or really very good at rigging (I guess) but the way I've done this in the past (in 3dsmax) is this: Dummy/Point helper just above the clavicle, as the "root" for the strap. Dummy/Point helper for the bag. Then a Spline-IK setup with 3 or 4 control points (depends how much control you want) down the front…