Go to your nearest Home Depot or Lowes and pick up a few of
those carry-around plastic organizers as shown here. They are
perfect. I have at least six of them full already and the best part is I
can actually find stuff when the need comes. I store everything that
will fit in them: wrenches, tapes, cleaning stuff, eyepieces, filters,
caps, magnets, mirrors, extra parts, remotes, tubes, extensions,
polarizers, close-up lenses, Teleconverters, and of course small
lenses. I even have one case just for flash stuff.
Everything is safe and findable plus I can carry them around
anywhere I wish. If you have too many small parts, give these
cases a go.