Attaching fly line to backing is a crucial step in preparing for fly fishing. The backing provides a reserve of line behind the fly line, which is important for fighting large fish or casting long distances. There are several different methods for attaching fly line to backing, each with its own advantages and disadvantages.
One common method is to use a nail knot. To tie a nail knot, first pass the backing through the tip of the fly line. Then, make a small loop in the backing and pass the end of the fly line through the loop. Pull the end of the fly line tight to cinch the knot. The nail knot is a strong and reliable knot that is easy to tie, even in the field.