There are some good ideas collected here for limited space and travel options-

• I turned a Cheap Chest into an EPIC portable Hobby Workstation by Jazza
• Ultra Portable Paint Case by Miniac
• Building a DIY Mini Paint Station with HobbyZone Modular Workshop System and an Ordinary Shelf
• Super budget paint holder! a 5/8" socket pressed through foam is the perfect size for dropper bottles! by MythrilMinis
• Sphere products painting workstation
• ArtBin Carrying case
• A toolbox
• Makeup Train cases are easy to carry and often great deals for the amount of space in comparison to miniature specific solutions.
• The Painting Case 2.0
• My Portable Paint storage system