When I'm out on shooting trips, I usually sling the shooter around my shoulders. This is why I invested in a tough Domkestrap. However, its boring design may not go down too well with some shutterbugs, so I'll probably recommend them the Seat Belt Straps.
Apparently, these 2-inch wide straps come from retired vehicles that have been restored to make sure they can handle the weight of dSLRs. The buckles are rounded to prevent them from jabbing into your ribs.