Is an Exo-Terra 18X18X24 big enough to house an adult Sinaloan Milk Snake?

I have recently purchased the Exo-Terra Cameroon kit which is 18X18X24. My gecko happened to die a few days before it got to my house though. I was thinking of trying out a snake and I am in love with these milk snakes. What size do they grow to and will this setup be big enough for its entire life?