I love, love, LOVE my StablO for urban sketching, watercolor on the go, and just plain keeping little fingers out of my stuff! If I lost it, broke it, or otherwise found it unusable; I would buy a new one to replace it. I go into depth on how it is used in the video, but let me know in the comments if you have any more questions. A great big shout out to Liz Steel whose blog turned me on to this wonderful wooden contraption from France.
Buy the easel here: stablo.fr/en/home
Check out Liz Steel!
You can see in the video that I have one brush holder, two cup holders, and two cups. It only comes with one cup holder and one brush holder. I purchased the cups and the extra cup holder separately.