What I did was buy some of the clear holders that fit in a loose leaf notebook. I sewed across each one a few times so I ended up with little compartments per each sheet. then I put the thread in numerical order and slipped them inside the compartments. the openings were on the left side of the page. If I had l lot of one color number, I had a deeper compartment. I've used this system for over 10 years and it seems to work.