Mine is custom made by a local leatherwork guy, I can get a picture later tonight when I am home if you want. I have worn a small pack over the rifle as well, it means you have to drop the pack first. If I am just out for walk for a couple hours I can get everything I need on my belt and pockets. Its great having both hands free and it does not snag on the bush everywhere because of it riding straight up you spine. It is easy to get in action, drop the offhand shoulder strap and swing it up like a normal rifle sling. I put Flush cup attachments on it so I can swap it to all my rifles (which all have flushcups now).
He also padded the straps and even carrying my heavier precision rifles it is comfortable. The only thing I would say is when you carry a bolt action to make sure you carry it with the bolt out or it digs into you. Large scope turrets might also, but I only find its when I bend over and the rifle comes closer to back, walking normal its never an issue.
I can see if he is still doing the leather work and get a price, I have had it a few years now.