I took a quick 3 day trip to Sedona last week. I was able to finally test out my Guerrilla painting box. It worked very well, and I'm happy with my purchase. It held the panels snugly when closed, so they didn't shift around or smear.
I believe this was one of the Thunder Mountain hiking trails. I also did some painting on one of the Schnebly Hill trails the next day. It was a good time. Though I did find out the hard way that I need to invest in an umbrella, a hat, and sunscreen.