|I store my bobbins in the boxes in which AOL sends their free software. The boxes are made of metal and are very shallow, so the bobbins lay in a single layer in the box. I asked my friends to save them and now I have to turn away these boxes! I mark the lid so that I can know which boxes has which colors of thread. I also keep a box just for empty bobbins.
To keep the thread from coming loose from the bobbin, I use a small piece of tape. I tape the thread end to the outside of the bobbin case, then write the number of the thread color on the tape (masking tape works very well for this). Since I only use one brand of thread, I always know which thread spool matches which bobbin. If you use more than one brand of thread, you can figure out a coding system so you'll know which spool is which.