I am getting a hatchling blood python tomorrow via mail.

I know that a proper enclosure measures 200-300 square inches. I have two tubs; one that is 140 square inches and one that is 345 square inches. Until I can get a properly sized tub, which enclosure should I use?

I'm not sure of the exact age or length, but he's under 6mo old.

Which enclosure should I go with? A bit too big, or a bit too small?