I'm new here but I think the 10G is perfect for 5G batches. If you get a large grain bill you'll quickly find that you'll need that overhead space in your MLT! If you do some high OG beers with huge grain bills like 15-18 lbs. (those are big to me as a noob, there are probably larger grain bills), it'll be just right.
I did a Pumpkin Ale and put it in my 10G Rubbermaid Cooler and it was about 3/4 full when I put the sparge water in it.
I think you'll find the 10G is just right for 5-5 1/2 G batches.
Good luck!
Jeff
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