The Amazon Basics Cat Litter Box Enclosure is a great way to keep your cat safe and comfortable. The durable plastic construction is easy to clean and is a good way to keep your cat from getting into trouble. The double doors provide easy in and out access and the wide door opening makes it easy to get your cat in and out. The enclosure is compatible with most standard sized cat litter boxes and can accommodate larger boxes up to 24. 8 x 18. 11 x 18. 3 inches.