I carry a sketchbook. I do. But, sometimes sketches don't always happen in the sketchbook. The top image was done on a piece of dot-matrix printer paper. While those printers are not in high use, there's nothing wrong with using the paper for things like making lists. Then, there's the instances where I sketch on my lists like the the next two images. There is a good deal of pressure to carry a sketchbook and do something meaningful in it. Afterall, someone may want to flip through.