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I like fly reel backing. It’s cheap, lasts forever and you can fill up most of your spool with it and fish 50′ of your good/premium line in most applications. If you hook a big fish the fly reel backing is very easy to work with in cold temps. A big plus is because you’re only fishing 50′ or so of your premium line you can change it out frequently without wasting much money doing so.
You can usually find spools of fly reel backing for $4 – $9 depending on quantity and it comes is different colors so you can customize your setups so you can tell them apart from your buddy’s rods/reels.
Fly Reel Backing on Amazon
Tip up line also works well.
I couldn’t agree more; 20-30# test is what you’re looking for. Don’t get gel spun as it’s a thinner diameter line and that’s not what you want. You want a larger diameter line for backing so that it requires less line to fill the spool.
As James mentioned, fill the spool almost completely full of backing and then add a shorter amount of your actual fishing line. 50-70′ would be about right, depending on how deep you are fishing.
Spray some Reel Magic or what ever line conditioner you like on the backing and you’re all set.