【 NOTICE 】: Before purchasing, please measure the dog's sitting height (from front legs to the top of the head) to ensure that the dog's sitting height is within the recommended range, otherwise it may be too large or too small; L size: 17.4*13.4*10.6in, suitable for cats less than 15.4lbs; for dogs less than 13lbs and sitting height ≤15.6"; XL size: 19.3*15.7*12.9in, for cats that 15.4lbs~24lbs; for dogs 13lbs~22lbs, and sitting height /15.6"~17.6" 【 EXPANDABLE DESIGN 】: Expanded size: 13.4" L x 24.4" W x 17.3" H. This pet backpack with an expandable back design gives your pet more space to rest and increases airflow, allowing your pet to move around more comfortably and reducing anxiety. 【 GREAT VENTILATION & VISIBILITY & COMFORT 】: A 3-panel acrylic board design can provide excellent light transmission and visibility. 4 ventilation holes are located on both sides and at the top with a breathable mesh, ensuring airflow and no sultry heat. To enhance comfort, the pet cushion is placed inside the bag's bottom and has a removable, washable cover. This ensures your furry friend has a spot to rest while on the go. 【 ERGONOMIC DESIGN 】: Widened and padded design, adjustable shoulder straps help reduce the load and increase comfort, as well as adjustable chest and waist buckle design of the cat carrier backpacks to prevent shoulder strap deviation and maintain the stability of the pet puppy carrier. 【SAFETY & STORAGE 】: 1, Made of high-quality Oxford Cloth, waterproof, anti-scratch, and non-irritating, let your pet breathe freely and relax. 2, Adopts lock-type zipper design to prevent the zipper from being opened by pets. Built-in retractable hook safety rope to prevent pets from escaping. 3, The pockets on both sides can store food, water bottle, poop bags, and some necessary accessories. Why choose the Pecute pet carrier backpack? -Comfortable and stable design: The adjustable shoulder straps and buckles with widened adjustable shoulder pad help reduce the load and increase comfort. The two buckles for the chest and belly of the pet backpack help to reduce shaking and keep the carrier stable during travel. -Convenient storage: The cat carrier backpacks have pockets on both sides to allow you to store food, trash bags, and other necessary accessories, such as bottles, snacks, keys, cards, or mobile phones. -Safety features: The cat backpack comes with a built-in safety belt that you can connect to your pet's collar to prevent them from accidentally escaping or falling. -Sturdy and comfortable cushion: The dog backpack carrier has a removable firm bottom that features soft cushioning for your pet to sit or sleep comfortably. Overall, the Pecute pet carrier backpack offers a comfortable and stable design with convenient storage and safety features to ensure a safe and enjoyable travel experience for you and your furry friend.