When traveling, watercolor is the perfect medium to take along, and this case was designed just for the watercolor artist on the go!  It's large enough to carry all of your essential supplies, but compact enough that it won't take up a lot of space in your bag.  It has an insert page with loops to hold 6 brushes, pens, markers, or pencils, and that page is removeable, so if you don't want it, you can take it out and have more space in the case for what you need.  Another perk to this type of case is that if you don't have a table or desk to sit and paint at, it lays flat on your lap and provides some stability for you to work on.