EORTA 2 Pack Portable Pallete Cups Stainless Steel Double Dipper Large Mouth Paint Cleaning Container with Screw Cap and Clip for Watercolor, Gouache, Acrylic and Oil Paint

These couple well with a thumbhole palette and a small watercolor sketchbook for painting in the great outdoors. The rubber gasket on the lids seems to be water tight, and the clip attaches firmly to my sketchbook.