OLIISS pet backpack has 3 modes: Portable, Oblique Span, Shoulders, and you can switch at any time. Designed for the best and most convenient travel outdoor experience for you and your pet! There is a big storage bag in front. On both sides of the backpack there are small windows, allowing small pets to observe the outside scenery. If the sun is too harsh, you can put the curtains down. And also both sides of the bags and curtains are designed with PVC soft mesh ventilation, the bags not only ventilation but also storage of goods. There are buttons inside, summer can be installed a pet fan, drive out hot summer days for pets. Measures approximately 14.5' x 10.2' x 14.5' (L x W x H) fits cats up to 17 lbs. Weight: 4 lb. Please confirm the size of the pet before you buying. Designed with Safety in Mind, the backpack comes with safety strap to secure your pet and prevent escape. There are also Woolen mat, so that pets can lie comfortably in their backpacks. OLIISS pet backpacks are made from ecological canvas. Eco-friendly, easy to disassemble and easy to accept. The backpack is washable, if your pet backpack is dirty after a period of time, you can also wash it with water. Don't worry about damaging your backpack.