Try Iris brand instead of Sterlite or Rubbermaid. They are glass quality clear plastic, have a totally smooth interior, come in a good range of sizes and Iris doesn't constantly change their tub dimensions on you. A lot of rack manufacturers use them for these reasons.

We have a few Iris tubs and will slowly be changing all our snakes over to this brand as we build our own racks. I love my Iris tubs!