Aara rubber cord is an aid that you might not know you needed but once you try it you don't want to give it up.
You can use the cord as a stitch holder or move easily your stitches on the cord while trying on your WIP. Just set the end of the cord to the knitting needle tip and carefully pull the cord through the stitches.
Aara rubber cord comes in a handy metallic case where you can store your cord when it's not in use. Case includes one 3 meters long cord and you can cut it in pieces that suits your purpose best. For example 70 cm is a good length for sleeve stitches.
Size of the round metallic case: diameter 5.0 cm.