This last Saturday, before leaving for the regatta organized by the Universidad Politecnica de Valencia. I only t had with me this very bad 40 gr paper. The positive part is that I do not feel bad wasting it and ended up doing 12 drawings! Here is the first.
By the way, the sketchbook is the same that uses Alvaro Siza (The famous architect and Pritzker Portuguese), and therefore (almost) all architecture students em Portugal carry it!