This sketchbook is a bit of my baby - back in May my friend Silena introduced me to the concept of bookbinding your own sketchbooks and using materials you have lying around forever.
So for this one we used the old book-cover we found in some second-hand shop and really thick watercolour paper (Hahne Muhle 350 gr I think). In the back and the front I also put some cheap watercolour paper as well, mostly as testing ground.