Big Spacel & Lightweight & Foldable Cat backpack carrier measures 13.78"L x 10.63"W x 15.74"H (35 x 27 x 40 CM), big stereo space, fits pets' max weight up to 20 lbs. Fits small dogs, puppy, kittens, fatty cats, rabbit and so on. However, the cat bag weighs less than 1 kg, which is light and easy to carry. The foldable design makes your pet backpack easy to store, easy to assemble, saving space when not in use. Large Ventilation Window+Large Field of View Cat carrier backpack with 4 Front Ventilation hole and 1 top and large sheer mesh windows on both sides give your pet more space to rest and increase air circulation.front of the backpack are made of PET transparent material, and three large viewing windows allow pets to enjoy the scenery outside with you, no longer alone,top blackout curtain can be pulled down, which can not only block the sun, but also protect your pet from anxiety. Comfortable fit and easy to carry you pets The sides, top and backpack can all be opened as your pet's entrance, providing your pet with 3 easy ways to get in and out of the carrier. With the window up, your pet can stick its head out and enjoy the view while on the go! Features extra thick padded back and padded shoulder straps for a comfortable fit. Comes with adjustable waist and chest straps to help give you extra support and you won't feel as heavy. Fastening stable and safe Our carrier is made of high-quality oxford cloth that is anti-scratch and features a solid steel wire frame that ensures stability and prevents collapse. There is a safety belt with a hook inside the cat backpack, which can be connected to the collar of a pet puppy, and the small animal will not jump out when it is mischievousalso a moisture-proof warm cotton pad inside, which can let your kitten enjoy unlimited travel happiness in it Enjoy Trips with Your Pet: This backpack carrier is lightweight and portable, you can use it to carry small dogs or cats for biking, hiking, camping, out walking or meeting friends. It allows owners and their lovely pets to have more adventures together, There are also pockets on either side, which are very useful for treats, dog wipes, collapsible bowls, etc.Built with unique and firm structure, falls completely flat when not in use, perfect for outdoor activities traveling walking hiking.