- 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