This is my old set-up for my travel easel. I took an old 9" X 12" art box, filled it with my paints and spirits and palette knife and then used big clamps to hold my panels on the frame of the opened box. This was not always secure and a fewtimes the wet panel popped off during painting landing wet side down. I would pack it all into a back pack with paper towels, brushes and a tripod. It worked but holding the palette and not having it built in left me struggling with the use of only one hand. Another problem was transporting the we canvases. I would use two panels and place cut corks in the corners and then secure this with rubber bands and touch up the corners when I got home. I asked for advice and I got it from a very great artist in Germany, Edward B. Gordon (check out his blog through my profile).