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 Transparent Window: This pet backpack as a transparent space capsule allows pets to see the outside view accurately and thus enjoy the sun and landscape Comfortable handle: Backpack design with a stable handle on top, easy to carry. Smooth zipper easy to open and close Internal hook design: On the back of the bag is a hook design that can fix the pull rope and prevent pets from escaping Removable floor mat: The soft and comfortable mat can be easily removed for easy cleaning and keeps pets clean and sweet Properties: Carry pets to travel around the world together The hard space capsule shell prevents the backpack from biting and scratching and effectively protects your pet from dust, pollen and flu With a small pocket on the side to store food in case the animals get hungry Its lightweight