I don't know why i didn't think of this sooner!! I bought an A5 soft backed sketch book and just trimmed it down to fit my back pocket perfectly. Don't know why i can't just buy an A6 one, but hey, it was only £1.20 or something. It's a Seawhite of Brighton, 140gsm, so good thickness and it's that nice off-white. When i was at college, I always used to use cut-down office files, which i filled with cut-down sugar paper and hole punched to go in the file (you could also throw out those real bad drawings without anyone knowing!!). I don't know why it took me so long to do it for my problem back pocket sketchbook of choice. It seems to be working out fine. You can see my vague crop points on that first page. The staples were quite wide apart, but i managed to get it to fit. I love it when a plan comes together!... don't give me no moleskin sucker! There, knowledge imparted, i can move on.