So I got a pack of two small moleskin sketchbooks. They were pricey, but so far I've found them to be just the right size for me. They're only 3.5" by 5.5" but I find it's easier to work in for several reasons: a, I don't feel obligated to make big art to fill the page and b, working at small, thumbnail-size proportions helps me keep my ideas intact. I sketched these at a coffee shop yesterday. I definitely intend to make this a weekly habit.