I usually tie the knot fairly tight about 5-6ft from the bait. If a big fish hits it then it does sometime have a tendancy to slide up the line some but it's no big deal because you're going to reel it in anyhow to either get them or check/replace the bait. Even large pinfish or grunts hooked in the tail trying to swim down don't make the balloon slide on the line. Mine only pop every once in a while but usually it's due to a toothy critter like spanish, bluefish, or pesky ladyfish.