Looking for a good heavy duty sling

Originally I was thinking just to lug it around, but I would like to use it for getting into more stable shooting positions such as sitting standing etc. it does not have to be leather
 
I use the TIS Slip Cuff QD. The cuff can cinch on the arm and clips on and off the sling. At just under 1.5" wide, it's quite comfortable on the arm and can handle any stick I have put it on.
 
I just went through the "I need a sling" dilemma. It was a very tough choice but I ended up buying the rifle only bungee. It seems to be the best of everything sling,. Incorporating unique features of all the other slings on the market. I will say it is a quality made product but you pay for it.