This is where the Rubbermaid type containers come in handy. While a select few have dividers your best bet is to see what they have in different gallon/quart sizes so the one will fit in the other. You may be able to fit several small ones inside a larger one and still have room for the robot.
I've purchased many of these different containers over the years for storage of car parts, model trains and even X-mas decorations. Walmart, K-mart, Target, Costco, BJ's and several other stores generally have these on sale often.
