I use 3" x 5" zip bags that I got at a packaging store in town. But I've also seen similar bags in the candy dept. at grocery stores or craft stores. The ones I have were $1.75 for 100 and I put the spool of thread and the bobbin in one bag. Also I have some large cones that I put a pipe cleaner through hole in the top (and come through the cone) and add the bobbin and twist closed.