I believe if you intend to batch sparge, then the size of the MLT isn't as important. Might be important for fly sparging, but I'll let a actual fly sparger comment on that.
I converted a 48qt cooler for 10g batches, and use it for 5g as well. Just remember to preheat the cooler, as there is a lot of head space for heat to dissipate into when doing 5g batches.
Cheers,
Rhino
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