Don't ask what the smallest you can use is. Ask what the best you can use is!
I don't mean to be rude but if you don't have room to have as big enclosure as your snake needs, then you should find something else to keep.
But I'll try to answer you. The females need bigger tubs than the males. Adult females should be in a V70 tub (about 34x18 inch), and adult males can be in about 23x16 inch tubs.
I like to keep both males and females in V70 tubs.
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