Yesterday was the first round of the OneWeek100People2017 event. It kept me occupied for most of the time available to me for sketching. The result was posted on Instagram.
I also finished the sketch of my previous post with a watercolor wash.
The paper I used for this is Strathmore Aquarius ll, which has only an 80 Lbs nominal weight but stays fairly flat when it gets wet without taping it down on a rigid board. If one folds a full size sheet (30″×22″) in 8 sections and makes some incisions from opposite sides, it can be folded into an accordion to make a compact little sketchbook that is receptive to watercolours. A Google search of “watercolor accordion book” will yield a number of websites with detailed pictorial explanations providing several variations of this.