First part of what is needed in a good plein air painting easel for watercolor painting. The second part shows how to make an inexpensive lightweight one.
Advanced Series Watercolor Package – En Plein Air Pro
YSHC ART Plein Air Anywhere Pochade Box, 17x13.7x5.2 Inches
My Plein Air Kit for Watercolors - DIY easel and more
Laguna Model Easel, a large multi-functional adjustable height tripod aluminum artists watercolor, field and display easel that converts from vertical to horizontal positions, or any angle in between. It's designed for floor and tabletop use and collapses down to a compact 28 for quick storage into the shoulder strapped carrying bag for easy transportation.
US Art Supply Large Watercolor Aluminum Metal Easel
Plein Air Paintings — Paul Valdez Fine Art
Cool Clips' - Fostering Digital Participation
Stretching Watercolor Paper on Masonite Board
Traveler Series Watercolor Package – En Plein Air Pro
Plein Air Watercolor Easels: Which One Is Right For You?