Spare parts storage... What's yours

[Hemiscorpius lepturus]

I have that exact same home depot box, very handy, saved me a lot of headache when I had to wait 3 days after taking the gun apart before I could put it back together

[Boris_LA]

....I start with a small baggie, usually the ones that the CGW or CZ parts come in.  Then I add tape labels to the parts I remove from the gun and put the factory parts in the CZ CGW baggies as I replace them or screw them up.  The individual parts baggies go in to quart freezer bags with the gun model written on the outside.  Those baggies go in to a larger baggie, which are thrown in to a large tub on the floor of my shop. 
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Same here, except baggies end up in the box on the shelf in the garage and parts labeled with masking tape and sharpie. Different boxes for airgun parts, firearm parts, scope mounts and rings, etc...