Hemp. Once it gest it's intial stretch out,it's done,.Synthetic ( nylon and the like) keeps on stretching.Particularly bad when you lash a pack down and have to stop in a mile to retighten it
If it breaks, hemp can be spliced and you can put a nice crown knot ot back splice a loop into an end. Nylon, all you can do is burn and melt the ends.
Hemp is easier to untie as the nylon will stretch and get so tight a knot is impossible to undo.
