Double batch mash tun size?

I'm looking in to getting a mashtun for double batches (10gal beer). Is it best to use two smaller coolers or is there a certain size that is ideal for doubler batches?

I'm still a 5 galloner, but I would say you're going to want one mash tun. This will alleviate a) the possibility of having more of one type of grain in mash tun A vs mash tun B. Not sure if this could affect your conversion or not.... And b) the possibility that mash tun A is mashing at a different temp than mash tun B.

I'm sure it's possible to do, but I wouldn't recommend it personally. Also, that's twice the amount of equipment to clean... which sounds not fun.

check out this info Bobby came up with
https://www.homebrewtalk.com/f11/how-big-your-mash-tun-needs-123585/

This link should help you:

https://www.homebrewtalk.com/f11/how-big-your-mash-tun-needs-123585/

For what it's worth, I use a 70 qt. Coleman Xtreme and it works great for 10 gal. batches.

10 gallon Rubbermaid will work great also.