I'm very disappointed with this product! The top of the litter box does not snap or lock together with the base. The design is suppose to lesson the amount of litter tracked back onto the floor. However I can not tell much difference from the litter mat and regular style litter box. Which was easier to clean up.The litter that is trapped on the steps is a horrible design(How do you clean that up without dumping  all of the litter?) The steps are attached to the box.... wish this design  worked better, liked the concept. Probably going to return.