【 GREAT VENTILATION 】: Comes with 4-side breathable mesh windows, giving plenty of air for pets. Makes it easy for you to observe the movement of your pets while they are enjoying the scenery outside.【 ERGONOMIC DESIGN 】: The widened & padded shoulder straps and back provide support and help reduce load and increase comfort. 2 retractable buckles on the top and bottom of the cat backpack to prevent shoulder strap deviation and maintain the stability of the dog carrier.【 COMFORT & EASE 】: The pet backpack carrier offers multiple ways to let your pet in and out with ease. For extra comfort, pet cushions are used on the bottom inside the bag, giving your furry friend the perfect resting spot while on the go. It can be removed and washed separately. 【SAFETY & STORAGE 】: 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, Adopts lock-type zippers 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. 【BREATHABLE and VISIBLE】- There are 4-7 (when expandable or non-expandable) tear-resistant breathable mesh on the front, top and sides of the cat backpack, which makes it more ventilated and convenient for you to see your pet inside. The top of the dog backpack can be opened to allow your cat/dog to stick its head out. 【Premium and Functional】- Made of quality polyester and anti-scratch mesh, this expandable cat backpack is sturdy and safe for your pets. 2 side pockets to store pet supplies, and a built-in safety leash to prevent your pet from running away.