I decided a few months ago that I won't be doing traditional plein air painting anymore, it is just a burden to keep the supplies fresh and clean, while avoiding the extreme heat here in the desert, especially with acrylics. ( don't leave a stay-wet palette in the hot car!) So I switched to using my Samsung tablet, but the glare was overwhelming even in the shade, so I built a portable shade box for it and the results are far better than I thought could happen.
Supplies: 1 old amazon box, I spray painted the inside a flat dark grey, black could work too
8- 10 pound velcro strips
1 old tripod easel