I was going around several Goodwill stores today in order to buy a small table, to re-purpose as a studio palette. I did find a table, but I also found this awesome antique coin-collection box that I bought for $6.
The thing about this coin collection box is that it has grooves for fitting panels of exactly 14"x11", which happens to be a perfect panel size of outdoor painting (good thing I had my measuring tape with me, since I was measures tables). My Raymar panels fit perfectly inside this box (see below). Raymar sells plastic panel carriers for $30. The Raymar carriers hold 6 panels in 3 tracks (panels are back to back), while mine holds 20 panels in 10 tracks!!! I am now ready for an extended, plein-air painting trip.