Minimum size container? Are (5) gal. buckets too small?

[nniemiec]

There's been discussion in the past about what experienced growers believe to be the "minimum" size container for growing toms.

Currently I have (2) plants per 18 gal. tote, however, the totes are aging & I'm looking to rebuild for next year. Can I do well w. (5) gal. buckets or do I really need at least 10 gal. per plant? what is the min. size for maximizing yield in a container?

Thanks in advance for sharing your expertise.