I use a Holbein waterbrush, and love it! It's a round about a size 6 I would guess, and I'd like to get a flat too. Makes it so easy to go out
plein air painting. The waterbrush, black pen, and pencil fit right inside my small folding pallette, along with a folded piece of paper towel. Grab that and my moleskin and off I go! Patty