Izzo makes a dual strap, but I dont think the Titleist Staff bag is designed to ride on your back?

They are made to be carried. The tour caddies tote those Tour Staff bags for the pros every week and they week 10.5 pounds empty. It is a rough life for a caddy and many have back problems when they retire. Why not consider a Staff Stand back which is a lot lighter.......of course it is all about choices. Type in conversation double strap for golf bags on google and you might find one on ebay or amazon.