9 ventilation holes design: 9 breathable ventilation holes and 2 side windows for full air circulation and ventilation outside, puppies and cats can stay in this backpack without feeling stuffy _x000D_ Transparent Window: This pet bubble carrier backpack as a transparent space capsule allows pets to see the outside view exactly, allowing them to enjoy the sun and the scenery _x000D_ Comfortable handle: Backpack design with a sturdy handle on the top, easy to carry. Smooth zip easy to open and close _x000D_ Internal hook design: There is a hook design on the back of the bag, which can fix the pull rope and prevent pets from escaping _x000D_ Detachable Bottom Mat: Soft and comfortable mat can be easily removed for easy cleaning and keep pets clean and cute