On a standard fly reel, and they're all about the same size, if you spool you're backing to about half the diameter of the reel, then that's about right. Don't forget, as you get closer to the outer diameter of the reel, each revolution holds more line because you're line is going in a larger circle. Since the actual fly line is thick, it will take up this space. Also, when you attach you're backing to you're fly line, use an Abright loop (knot). If you don't know what that is, just google it and follow the instructions.
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