I go to the sporting goods department and buy those boxes meant for the plastic fishing worms. They are just the right length for a the new floss and when on a bobbin they are just wide enough to fit inside. I have many, many boxes such as this because years back when Walmart was closing out this type of inventory, I bought two to three of each color for ten cents each. I ended up with lots and lots of thread. Plus, when my sister passed and I got her thread.