I never realized how lucky I am that my machines can all use the same type of bobbin. Or more correctly two types of bobbins, but one is metal the other plastic, so easy to keep track.
I have a variety of bobbin storage solutions. The tunnel for metal bobbins. Two donuts, one marked cotton the other bottom weight (for embroidery). Janome bobbin cases for my pink and blue bobbins. And lastly my thread stands. When I am working on an embroidery project that requires the bobbin thread to match the top thread (Hoop Sisters), I put the filled bobbins for each colour under the spool of thread on one of my thread stands.