Went to my inlaws place for dinner last night. They have cats there so instead of leaving Gizmo at home, I took his new playpen, which is actually a 4XL soft kennel I won on Ebay from Pet Attitude.
He has tonnes of room in it to play or sleep plus it has a waterproof bottom in case he has an accident but he's pretty much toilet trained now so that's not an issue.
He's safe in there from the cats plus the cats are safe on the outside from him.
I can fit in there with him as well which is good because I can't stand being away from him for too long.