I store bobbins on wooden stirring sticks (coffee stirrers). It means that you can store matching bobbin and thread,saves you hunting the next time you want to use it. I stick these in a container with polystyrene packing block .It means you can see at a glance ,keeps them upright and free from unravel.
Usually these sticks are 1/4 inch ,super for quick guide. Use to push out corners. Many uses from the humble stirrer at low cost.