Experimenting with Plein Air Easels and Sketchboards

I'm not entirely sure what to call these things: plein air easels, sketchboards, drawing boards? 

Whatever the right term is, I'm on the hunt for a minimal, easy-to-deploy setup for sketching and painting outdoors. The important restriction is that everything has to fit in my red art bag alongside all my other tools. So I've got three prototypes to test on my next trip.

Option one is a simple drawing board I cut down to fit the bag. I've added a quarter-inch T-nut so it can mount on a tripod, which gives it a bit more stability to the bag. It's just a flat sheet of plywood, 33 by 24.5 cm (about 13" x 9¾"). Nothing fancy, but solid.

Option two I'm calling a sketchbook holder. It's a prototype cut from matte board, 34 by 16.5 cm (roughly 13½" x 6½"). The clever bit is a slot cut into it where your sketchbook spine slots in. The back cover sits behind the board while the pages open out in front, held firmly in place with a couple of bulldog clips. The exposed board at the top gives you space for your sketching and painting media. There are plenty of DIY versions of this out there and I've been particularly inspired by Sarah Burn's design experiments. Commercial versions like those in the Etcher series are also worth a look. For my prototype, I'm using Velcro, though a lot of people prefer magnets.

Option three is a watercolour sketchboard, a bit bigger so it can handle larger sheets like an Arches block or similar pads. It's square at 29 cm (11"), mostly because I had a square piece of matte board handy. It loosely follows Doug's Sketching School design. The extra space means there are two configuration options: one end suits a bigger layout with a full size palette and room for a water container, while the other works better for larger pads but has less room for a palette and no space for water.

All three are light and fit neatly in the bag, so I'll take them all out and put each through its paces. With some creative use of clips, they can all handle pretty much the same tasks. Tripod mounting and a water bowl are the exception for now, but maybe I'll sort that out later.