It really depends on your target species and style of fishing. Jigging walleyes in under 30 ft of water, then 100 yards of top line is plenty. If you long line troll for king salmon that run like the dickens, then you might need 200 yards. If casting shorelines for bass is your thing with 30 lb braid then you may only need 50 yards as most times it's hook and winch. If casting for walleyes from shore with jigs or cranks, I would say 100 yards is plenty. Unless you are talking tailrace currents. Then I would put on 200 yards as some of those bigger girls can really battle it out. Sorry for the long winded and somewhat nit picky answer, but the devil is in the details. Good Luck!!