Can I use 45 lb test backing for fly fishing for lighter fish?

I’ve got a 5 weight rod/reel and 5 floating WF line. I need backing. There’s some 45 lb test cheep. Can I use it?

According to the box: “45 lb. line fits in the space of 125 yds. of conventional 20 lb.” Will this work on my setup or should I throw in the extra money and go for a smaller backing?


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