I purchased a Kitty Twister to see if it would keep the smell in as advertised and I’m happy to report that it actually does... my washroom is odor free! Amazing! Because I liked the quality of the Twister, I decided to go ahead and order the matching Kitty Cave and Litter Box and I’m thrilled with ALL THREE... a cute ‘suite’ for my ‘sweet’ Petunia. While she loves the coziness of the cave, I love that the twister and litter box make cleanup a breeze. We both thank you for your quality products!