I use a 7wt, and a 6wt rod for bass. I would say no more than 50 yards of 30# backing. I honestly have NEVER seen backing on any of my warmwater rigs. I prefer hand-twisting my own bass leaders with mono. I use Trilene Big Game in 10# primarily, with a micro swivel on a 6ft leader. It rolls over anything I tie on. I don't fish 6" bunny strip flies though. Mainly #6 thru #2 hair and foam bugs.