You may get some suggestions to use microbraid lines like Fire Wire or Pro, but I would caution you about those. There have been occasions where people used these products as backing and spooled them on a bit too tightly. With the flyline on, the mocrobraid relaxes and expands and can actually warp the spool with the pressure it puts on it. I would stick with 15 lb regular backing and not put too much on the reel. From there, I'd hope to see the backing sometime when I have a fish on

Jim Smith