I don;t agreed with you Slammin Steelies... Braided line ie, Tuff Line is way smaller in diameter then actual fly line backing other words, more backing can be put on same size reel and line. Sinces now, most ppl go for large abor or ultra large abor reel, you do need thinner diameter line to compasate the sapce taking by the abor. Also, most saltwater fly fisherman speical Tapon fisherman switch from backing to braided line becase its stand better with the abuse of saltwater, way stronger and smaller diameter.