Not really a container, but...

[Andrey_BY]

I'd like also to tell you one interesting thing about growing
tomatoes in the old leaky buckets from steel. I've just red a small article from one Russian gardener who use this technology during last 3 years and have double or even triple crop from such tomatoes grown in such buckets inside greenhouse. They have 1.5-2 times bigger
fruits as well.
He thought it is because of the same high temperature of soil near all the tomato roots inside such iron bucket while usual soil temperature even inside greenhouse is much lower than air temperature (this difference could be even 10-15 degrees C) and good air condition
for the roots because of holes in the bucket's bottom...

I will certainly try this method this year in my greenhouses for some tomato varieties just to compare with normal way of growing...