Given that there is a very large number of different types of screw how is
it best to store them?

By differences I am thinking of things like these:

Material and colour: steel, stainless steel, brass, black steel
Head type: countersunk, round head, others
Driver type: pozi/phillips, slot, hex (carriage screw)
End: point (woodscrew), flat (machine screw)
Measurement: metric, imperial
Specialism: self tapping, double thread
Width and Length

I have some screws in boxes, some in plastic envelopes, some in organiser
trays, some in cabinet drawers and some more specialised screws which are
effectively loose.

None of these storage arrangements is ideal for different reasons,
especially because none has enough compartments to store all the different
types and sizes. Is it worth mixing some together in tubs?

How do you store your screws (and washers and ...)?

James