My current book is large: Bee Paper Super Deluxe Aquabee 9" x 12" and I realized that it's too much to carry with me - especially in colder weather and with all the extra hats-gloves etc. that I keep in my backpack these days. As a result it's nice paper is being filled with post-it sketches from whatever paper was available... I used to have several books running at once bu it seems to be a much better resource when everything is under one cover.
Today was rather cold so I did these while waiting for my companions to finish lunch or to catch up with me - and finished some at home after a nice cup of tea ;)