Great for keeping odds-and-ends; I haven't confined myself to putting threads in them!
It's an absolute FAFF transferring all the threads on to the cardboard or plastic holders... In the end I resorted to putting the different colours into different compartments as I feel life's too short to wind thread round and round those plastic / paper holders!
This size box is absolutely perfect for keeping Plastic Floss Bobbins in, along with your scissors and other accessories. The bobbins can fit upright and facing forward and the lid still closes fully.
Great for cross stitch/embroidery etc.