This listing is for a new 175 yd spool of Airflo backing line

Please note spool design is currently changing from the one in main illustration.New packaging as shown in the photo when you click on breaking strain

 Please select your chosen breaking strain from the drop down menu. 20lb or 30lb 

Fly line backing serves two basic purposes. The first is to fill up your reel so that your fly line completes the filling of your reel to within, say, 1/8th inch of the spool capacity. The second is to still stay connected when a big fish strips of all your fly line!