Big snakes, small enclosures.

[zackw419]

I have been told from multiple sources that the larger the snake, the less 'roaming' space they need. Snakes that large won't roam, and curl up in one place until their next meal or breeding.
They don't need a whole lot of exercise.

See, that's my point.

Just because a snake can survive in a tub that size doesn't mean you shouldn't provide it the space to roam when it wants to. Even if infrequent.