Braid question for bass?

[utahgolf]

what about backing? I bought some 20 lb power pro and I have some 6lb mono I planned on using for backing, does it really matter the size of the mono backing? also I have a wiffle type spool, the ones with the holes, I heard if you tied the braid in the hole you don't need backing? is that true? I'd use backing just to save on braid tho.
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