My apologies, I meant to add a bit about the strap. I carry about 25 pounds on a day to day basis in the Bolt. The strap is excellent, well padded, with leather on top and grippy padding on the bottom. Waterfield's straps are generally the best I have dealt with. The padded shoulder area is 9 inches long and has a slight bend to fit to your shoulder. Yes it is comfortable to carry, and doesn't slip off your shoulder.
Looks very nice! I don't have a shoulder strap, just handles, but that one looks pretty nice!