Use these all the time
Relatively cheap, great to have some of these on hand. Hate to need them and not have them. Sometimes when airbrushing I'll mix a lot of paint upfront so I can come back and use it later either already thinned or if I'm missing colors.
So many uses
It's just a empty bottle. However, I find I use it to clean brushes, store mixed paint, etc. I like that it matches the other Tamiya bottles which satisfies my OCD.
Great Bottles
If you use Tamiya paint, these are exactly the same bottles used by Tamiya and are a welcome addition when thinning these wonderful paints with IPA.