Melissa and Doug On The Go Water WOW, is just that. It is a take anywhere colouring book. All you need to do is, fill the chunky pen with water and away you go. The great thing with this, is that it is reusable, so when the pages dry out, you can colour on it again time after time. Small enough to have in your bag, and that's if you child doesn't want to carry it themselves, with the handy handle.