1. Expandable Design: Front Part 16.53 x 12.2 x 11.42 inches. Expandable Back 16.53 x 12.2 x 23.6 inches. The cat backpack bag has a large panoramic window to give your pet a different visual experience. The expanded back panel becomes a giant tent bed for outdoor time with nature and sunshine, helping prevent stuffiness in the backpack. 2. Characteristic: Space Capsule appearance. The unique space capsule design makes your pet feel safer, more comfortable, and gives a broader view of the outside. Breathability and ventilation are enhanced by 9 holes around the carrier and two side windows for good air circulation inside. 3. Safe to use: Made of high-quality oxford cloth, waterproof, anti-scratch, environmentally friendly, non-toxic and non-irritating, ensuring your pet can breathe freely and relax. Sturdy strap prevents breakage during use. Smooth zipper and safety buckle. 4. Ergonomic Design: The backpack straps are designed to absorb sweat and relieve pressure. Thickened shoulder pad sponge, upgraded breathable mesh and polyester fiber material improve durability and comfort. 5. Use scenarios: - City walks or short trips where your pet needs a secure, comfortable carrier with a wide view. - Outdoor activities or camping where the expandable tent bed provides a cozy resting space while outdoors. - Travel or commuting requiring good ventilation and reliable safety features for longer wear.