I have a lot of different categories of threads, each type stored separately; they are all in drawers away from light and dust. I have them separated in such a way that I know exactly where to find what I need, without having to hire a detective. The largest supply of thread I have is machine embroidery thread; both polyester & rayon. I keep an up-to-date typed list of all my machine embroidery threads, by brand & color number. When I'm pulling colors for a design, I know if I have that color number and exactly where to find it by checking my list. Bobbins are in drawers, also, in those round rubber do-hickeys, so I can see the colors at a glance.