This pet carrier (17.3x13.6x10.4in) with an expandable back design gives your pet more space to rest and increase air circulation, allows your pet to move around more comfortably and reduces the anxiety. Airline approved? Each airline sets their own specific requirements, so it is advised to check with your airline of choice.1, The top of the dog backpack can be open, for your pet to stick their head out off, you can zip the cover on the mesh for breathability and visibility or you can snap on the shade cover to protect from the sun. 2, Three-sided acrylic sheet design can provide good light transmission. There are four venting holes + venting net design on the left and right sides to ensure air circulation and no sultry heat. Widened design, adjustable shoulder pad to help reduce load and increase comfort, two retractable buckles on the top and bottom of the cat backpack to prevent shoulder strap deviation and maintain the stability of the pet puppy carrier.The dog carrier has a removable firm bottom that can be unzipped and features soft, comfy padding for your pet to sit or sleep on comfortably. It can be used on both sides: the bottom mat is made of short plush. In the winter, pets can stay indoors to stay warm and comfortable; the other side is oxford-cloth design, suitable for summer, cool and breathable! It can be removed and washed separately!1, Made of high-quality oxford cloth, waterproof, anti-scratch, environmentally friendly, non-toxic and non-irritating, let your pet breathe freely and relax. 2, There are two bags for storage on the side of the pet bag, one for waste bags and dispensers and water bottle holders, another for storing a mobile phone, wallets, and other small items. 3, Built-in retractable hook safety rope with anti-escape zip to prevent pets from escaping.