This Dog Carrier Backpack is perfect for small and medium-sized pets. It comes in three colors: red, gray, and black. The backpack dimensions are as follows: S: 23 x 12 x 42 cm M: 25 x 12 x 48 cm L: 28 x 12 x 57 cm Made of high-quality oxford fabric, this backpack is machine washable and breathable. The thick material ensures softness and comfort for your pet. The large ventilation windows on both sides provide ample airflow, keeping your pet cool and comfortable. For added safety, this pet carrier bag features a safety buckle to keep your pet secure. The front of the backpack and shoulder strap are equipped with reflective strips, ensuring visibility and safety, especially at night. In case of an unexpected situation, you can use the outdoor life-saving whistle for help. The shoulder strap slider can be adjusted to fit all kinds of people, making it convenient for anyone to carry. The back and shoulder straps of this backpack are padded with extra thickness, providing superior comfort during long journeys. The zipper pocket allows you to store small items like coins, devices, keys, and cards, keeping them within easy reach. Whether you're going for a walk, hike, weekend adventure, travel, shopping, cycling, or using public transportation, this backpack is your perfect companion. It is suitable for medium-sized dogs like Keji, Teddy, French Bulldog, and Shiba Inu. Please note that it is not suitable for large dogs.