It's a well-known fact that cats are going crazy when they see packages, especially in our fanart Cute Cat in Package Sticker. They play there, sleep, eat, and practically do everything in that kind of bag. Some experts say cats love to sit on plastic bags because it clings to their bodies and makes them feel safe. Others believe the chemical that plastic bags are covered in attract their cats. Cats also feel the warmth the bag gives off when they lay in it.