I use a 10gal rubbermaid round cooler. Didn't particularly choose it over the coleman xtreme for any reason other than random chance, I suppose. I'm quite happy with mine though- I put a braid ring manifold in there (anchor both ends of the braid in a a T junction, basically, it's discussed in How To Brew by Palmer although there's some tweaks to his design that are needed), so I can batch or fly sparge.