It is one of the long ones with 2 locks but I always put stuff on top of it just to be safe and then ill prolly bungee it to. I had my ball in there before but it was way to big for him and I plan to allow her to burrow and such. She has already grown 3in or so since I got her less then a month ago. I know this is just the begining and shes about to go into shed again so about to be even bigger lol.