Montana Slings makes the best one I've used.
This. Pat makes great stuff!
I third this. The five round flip is just enough, not to big, easy to access, and fits well on my side. I typically position it about 2/3 back on my right side, so it is out of the way but still easy to get into when needed. Wipe it down with a little leather conditioner at the end of the season and it will serve you well.
