We use 10 gallon Sterilite boxes, fit perfectly. We built a pretty good system around Sterilite boxes, they have lasted many long trips. I think it's the 30 quart that fit perfectly behind the shelf in the 4runner, I use one of those for all the recover gear, the other one for food.
Sterilite - 1484: 10 Gallon Modular Stacker Tote
You can find them at Walmart.