This Sketchbook can be used with Pleinly Wet Panel Carrier which is included in Pleinly Watercolor Easel Set: If you are painting outdoors (plein air) you can carry this 8×12” sketchbook inside the wet panel carrier. You can fold the sketchbook pages open and put it inside 12×16” carrier and bring the painting securely back to home while it is still wet. Visit Pleinly Amazon store for more info or see the videos for details.