I have 3 different sewing machines, and so it's imperative that I keep the proper bobbin stored with the correct thread. I use this thread storage container, it has enough room with each spool to include the bobbin.
http://www.joann.com/creative-option...sz=54&start=55
It keeps me soooo organized - I love it. No more searching for the corresponding thread, wondering if it's the right manufacturer. (i.e. I have 3 different blacks - aurifil, guterman, and metrosene.) It's hard to tell which thread it is when in the bobbin, so keeping the bobbin with the spool helps stay organized!