Backing Filler What is “Backing” and do I need it? by Captain David M Rieumont 20.2k Views Sorry this content is for subscribers only Subscribe to continue reading. Already a subscriber? Sign in Thanks for reading TheOnlineFisherman.com Try one month for $1 Login See more Previous article What is a Sabiki Rig? Next article What is backing as used as a filler on a baitcasting reel and where can I purchase it?