I like to keep the bobbin with the thread, so I bought several packages of those bobbin holders that fit into the top of the spool of thread, and the bobbin snaps into the holder. However, I also bought several sets of thread from Connecting Threads, and the holes on the spools are too big for the bobbin holders. I don't yet have a way to organize my thread neatly (it's mostly in a drawer), so for now, I take one of those bendy plastic drinking straws, fold it at the bend, and put the folded end down through the hole in the spool of thread; then I put the bobbin on the piece of straw that is sticking up out of the hole. Works for now.