This is my second one, a pochade box by Open Box M. I bought the lightweight tripod from a friend who bought a bunch of them off Ebay a long time ago. It cost me $15.00. It has a quick release mount so it sets up in seconds.
The first palette bit the dust so I made another. It's a bit smaller than the original, which fit so snugly that in humid weather I had a hard time getting it out of the box because it would swell. I tape wax paper to the palette before I lay out my paints so it makes clean up a lot easier. Wax paper is somewhat porous, so some paint residue does get through.
Recently I bought a Coulter Plein Air System so that I could paint larger pieces outdoors but have to admit I haven't used it much.