Sienna Plein Air Supply Box Supply/Palette Box This Sienna Plein Supply Box is designed to work in conjunction with the pochade box and tripod. The supply box has two adjustable blocks that sit on the front two legs of the tripod. Adjusting the blocks raises or lowers the supply box on the tripod for the perfect working height. The cover unfolds into an accessory shelf to hold a solvent can, brush holes for wet brushes and other supplies. The supply box also includes a paper towel holder, which can be hung underneath the supply box to hold a standard roll of paper towels. Designed to work in conjunction with the Sienna pochade box and tripod Two adjustable blocks that sit on the front two legs of the tripod Adjusting the blocks raises or lowers the supply box on the tripod The Cover unfolds into an accessory shelf The supply box also includes a paper towel holder.