I love this thing!  This,  paired with a nice water brush pen (i use pentel aquash)  is pretty much all you need to watercolor anywhere,  anytime.  It makes it so much easier to paint.  Its about the size of my very small hand and can fit in any bag i have and most mens pockets.  Ive been usong it for months and the colors haven't run out yet,  but when they do,  i can just refill them c: