1) Versatile 3in1 design for cats Converts quickly between a pet carrier backpack, a travel stroller, and a portable pet carrier bag. Ideal for city walks, vet visits, and road trips. The foldable design saves space at home or in your car and meets cabin size limits (39x29x50 cm), making it suitable for cabin air travel or car journeys. 2) Smooth and detachable wheels Four multidirectional wheels provide effortless movement on various surfaces. When not in use, the wheels detach easily by pressing the four quickrelease buttons at the base. Installation and removal take only a few minutes, enabling fast switching between stroller and backpack modes. 3) Ample storage and enhanced ventilation Side, front, and back pockets hold essentials such as food, toys, and water bottles. Threesided breathable mesh panels ensure good airflow and visibility, helping keep your pet cool, calm, and secure during travel. 4) Durable construction and practical fit Built with a 300D waterproof PVC base and reinforced EVA padding. Equipped with 8grade antiburst zippers and 3.8 mm frame bars to prevent escapes, plus scratchproof mesh for additional security. The telescopic handle is adjustable from 50 to 92 cm to fit most car boots, and the overall lightweight 3.1 kg frame makes lifting easy. 23 use scenarios Scenario 1: Daily city walks and routine vet visits, where you need a comfortable, secure carrier that can switch to a hands backpack or a stroller as needed. Scenario 2: Road trips and travel, providing a compact, cabinfriendly option that can be carried, rolled, or pushed through airports and hotels. Scenario 3: Short flights or long car journeys, with a design that aligns with cabin size requirements and offers reliable ventilation and safety features for small pets.