I am just getting into all grain and need a mash tun. I normally make beers under 1.080 og, but could make an imperial at some point. I plan on doing only 5 gallon batches, so I am looking at a 10 gallon igloo but my concern is if I want a brown with an og around 1.044 that cooler will have too much head room. I don't want the 5 gallon size as I think I will find myself doing beers too big for it.... so I've searched around the forums and found no real answer.... any advice? Thanks