PawHut Pet Travel Backpack Bag Cat Puppy Dog Carrier w/ Trolley and Telescopic Handle Portable Stroller Wheel Luggage Bag (Grey)2 in 1. It can be used as a trolley bag or backpack With 4 detachable PU wheels for easy movement Plastic pull rod has 2 adjustable positions Breathable mesh fabric for air ventilation 600D Oxford cloth with PVC water resistant coating Steel wire bracket and aluminum alloy tie rod form a stronger structure Inside safety buckle lock for security With 5 nylon zippers for smooth opening and close