Stylish and lightweight: There is no sense of weight, easy to catty out. This unique semi-sphere window design,good for pet sight viewing.adn ventilation holes design,more breathable,comfortable and safty. Built-in lock can prevent the pet from running away or getting lost when the bag is open.Built-in lock can prevent the pet from running away or getting lost when the bag is open. Note: There is a protective film on the backpack. please remove it after receiving it Suitable for most of the cat, dog and some other small animals.