I have been using a 24 quart stock pot for my sous vide cooking and it worked fine. The only caveat is that the pot is 12 inches in diameter, which limited what I could cook.

I was going to order a Cambro box, like the one Dom and others have but as I was browsing Amazon I found another box by LIPAVI that also had a lid specifically for the Anova.

I used the box first time today and it was great! The only catch is that the way the lid fits does allow some condensation to leak over the side of the box, but fortunately, it was a very small amount.

The box and lid are ordered separately and they are not cheap, but I do like them. Now I just need to find a place to store it :-)

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Bravo!

but now I hate you... :-)
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Take the lid off and use ping pong balls. That's what I did and works great with the box
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I thought about getting the ping pong balls, but when I saw this I jumped on it -- one lid is a lot easier to deal with then all those ping pong balls.
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Michael, how is the fit around the Anova?
Do you get any condensation on the unit?
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The fit around the Anova seems to be pretty good. I have only used it for one cook, but I ran the (brand new replacement) Anova for several hours beforehand and I did not notice any condensation around the unit.

A lot of condensation accumulates on the lid (as expected) and a little leaks (some drops) out at the edges.

Next time I use it I will take some more pics.
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Michael, maybe something small in the center of the lid will help the condensation? Just enough to let it trickle back to the center and drip back into the container.
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The lid is hard plastic and is pretty flat. When I can I give it a couple of hard taps to get the condensation to drop off.
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Here are some pics. Note that while there is a small gap between the lid and the Anova, condensation does not seem to collect around the Anova,

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You can see in the pictures below that the condensation does seep out the edge of the lid, but the seepage is very little and more an annoyance than a problem.

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Overall, I am very happy with this container and I get some exercise carrying the full container (~50 lbs) between the sink and the counter...
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You know what else works as a great Sous Vide container for smaller cooks?
Those cereal containers! The plastic ones with the lids, like this one. The hole at the top is perfect for an Anova and requries little modification. Evaporation is not at all a problem with that thing.
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