To keep alcohol resin ink colors organized and prevent them from tipping over I modeled this holder that will contain 18 vials of inks and still fit in the original box. The holder can also be used a convenient tray to carry and organizer the vials and prevent accidental spills. The vials are 21mm in diameter and are nested against each other. 

You should be able to resize it for other pigments and paints as needed.

I just slide the whole tray out the bottom of the box to sit on the table while in use and just drop it back in when I'm done.