Features: The trolley features 3 wheels. But now can't be sold alone. This backpack is comfort and keeps a healthy posture for the children, zip closures keep the contents secured, rubber wheel of high quality, the wheel not easy to get stuck. The color of some bags are more or less different from the real bags, because we take photo it in the sun shine. Thanks for your big patience. Package Includes: 1 x Rolling backpack Fellibay Customers Service: Package Included: 1x Girls Rolling Backpack Tips: --Please refer to the measurement. Tiny measuring error is allowable in normal range. --There might be a little color difference due to the monitor, camera or other factors, please refer to the physical item. --Every backpack will be checked before shipped,if receive the item damaged, please contact us with the real products pictures. Fellibay is trying best to provide excellent service for every customer. About Shipment: Fellibay's parcels are shipped by USPS, FBA or FEDEX. Usually it takes 3-25 days for shipping. Sometimes due to the busyness of our system, tracking information may fail to be updated promptly and cannot be viewed on your order detail page. However, please do not worry about it, just get in touch with our customer service center as soon as possible and we will do everything we can to help you. Thanks for all of yours surpport. We will try to do better.