I tend to make my bindings at the beginning of a project to make sure I'll have enough of what I need. I sew a lot of scrap quilts, so naturally, my bindings are scrappy. I just did one in red, but there were 10 or 12 different red fabrics. Once folded and pressed, I store until needed on empty cardboard TP tubes and keep it in the project's bin. When sewing on the binding, I just put the tube on the extra spool pin on my machine and let it feed off of there. That way it doesn't get caught or drop on the floor or whatever.