Grants on your baby,
Make sure you have a way to secure the top down. when you ball gets bigger he will eventually be able to push the top open and get out.
I had a terrerium that had a lock pin I never secured it until one night he got loose. Snakes are escape artists. heh heh

You can use the strap down secure tabs used for computers they are cheap and your snake will never be able to push open the top. Just secure it on four corners.