I personally prefer to have the choice and several makers have been gratious enough to accommodate. While most makers I have dealt with do vey nice sheath-work, I have sheath preferences of my own that cause me to make my own when I can. There are cases where I feel that the maker's sheath complements the knife so well that I prefer to have the "package." That's always when leather is involved. For Kydex, I just have too many personal little time-consuming, picky preferences. It probably costs me more in the long run because I may do two or three before I get exactly what I want but I don't do it to save money, I do it to get exactly what I want. That way I am much happier with the knife itself as well.