I am working on a 3D printed design, trying to make it agnostic to the common bottle designs.
I have to be able to easily pick it up and move it, because I can't leave stuff like that out in my house (5 yr old on the loose).
When I travel, I have one of the plastic boxes that goes into a modern tackle box, it holds all the paints, tools, etc and goes easily into my luggage. But it only holds a small amount and doesn't organize them too well.