Brewing Vessels

Now there's an idea. I'm sure a big Rubbermaid container would work fine. The only challenges I could see would be getting the lid on tight enough to prevent contamination, and assuming you can indeed get the lid on tight, you'd want to drill a hole in the lid for a fermentation lock. Personally, I'd stick with the bucket system, which works just perfectly and is pretty easy to keep clean, snap the lid on, etc. But whatever floats your boat should be just fine. Heck, back throughout history, all sorts of containers were used.... barrels, stone casks, whatever... if it could hold liquid, it could be used to make beer.

-- Dave "Just a drink, a little drink, and I'll be feeling GOOooOOooOOooD!" -- Genesis, 1973-ish

I use a rectangular Rubbermaid cooler for my mashing. I have had no problems at all. I don't know what else you are asking about. I use round buckets for sparging but that is because the set up I bought came with round buckets. I suppose you could build your own using square buckets an have no problems.