How about a sketchbook thread? What do you carry and use? Do you draw in public?

I'll post my doodles. I try to draw whenever I'm in a situation where I'd be tempted to waste time on my phone (such as on my commute) or when I have a spare moment. I like using these little 'rokbook' sketchbooks which slip into my pocket. Sometimes I use watercolour but mostly I just get a pen and start scribbling.