What is fly line BACKING and how to use it.

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How to Attach Backing to a Fly Reel - Guide Recommended

TUF-LINE FB20100W Dacron Fly Backing 20Lb 100Yds White - Boutique

What is Fly Line Backing and How Much Do You Need? - Guide Recommended

Rio Multi Color GSP Fly Line Backing

Maxcatch 50/100/300 Yard 30LB Braided Fly Line Backing for Fly

What is Fly Line Backing and How Much Do You Need? - Guide Recommended

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Fly Fishing Tech Tips: What to use for fly line backing - Dacron