When it comes to connecting backing to fly line via loop to loop connections, there’s no doubt that the bimini twist is one the best knots of all time. Generally considered to provide 100% line strength, the twisted construction of the bimini twist actually allows the knot to stretch slightly, thus providing a knot strength that’s far superior to most other loop knots. We’ve used it the world over, from king salmon to bonefish and tarpon, and have yet to see it fail (if tied correctly of course!).
However, while we love the bimini twist, our favorite backing knot to connect to our fly line is the double bimini twist. Same knot, just doubled over beforehand to create two loops instead of one. By creating two loops, not only is the knot tougher against abrasion, but the extra loop also helps to distribute the stress on the loop of the fly line over a greater area. This helps prolong the life of your fly line by preventing the backing from cutting into the coating of the welded loop.
When fighting big fish, the last thing you want to think about is the strength of your knots. Give the double bimini twist a try and never worry about your backing connection again! Here’s how to tie it.