Never used! Perfect for small dogs and cats TSA approved carrier Pet backpack dimensions：15.2" L(includes side pockets ) x 11.4" W x 16.5" H. Perfect for dogs up to 15-pounds or cats up to 18-pounds. Easily fits cats, small dogs and most other small/medium-sized pets. Length: Neck to base of tail, height: Floor to top of shoulder. Breathable and perspective: three sides were made of PVC mesh for the pet carriers. Well ventilated design for optimal airflow and checking on your pet. Reduce shoulder weight: This pet backpack comes with chest buckles which help to reduce the burden and keeps the shoulder straps from slipping while pet moving. Keep your pet comfortable: Removable cozy mat for easier cleaning and let your pet enjoy it inside. Last long using and easy storage: Our premium pet carrier is quite scratch-resistant and sturdy for long-lasting use. you can also rest assured that it is strong enough to stand up to the scratches or gnawing of your pets.