Panda's Airtight Brush Washer is a great addition to your plain air set up or gear for oil painting. It is small enough to be easy to transport, 3 inches in diameter and 3.5 inches high, but is still large enough to hold 10oz of solvent.
 
It provides a surface to clean bristles against and allows the paint to settle below and leaving clean solvent in the top. The screen lifts out to make cleaning simple
Made of rust proof stainless steel with clip-on lid with a watertight rubber seal. The handle makes this brush washer easy to carry or hang from your Pochade box.
A removable strainer cup provides a surface to brush bristles clean and allows pigment to settle below.
Seamless stainless steel construction means the brush washer can be used for turpentine, mineral spirits, and other solvents. Its sturdy construction means it can handle heavy use and lots of travel.