Flyshine Children Kids Nylon Trolley Bag School Backpack Wheeled Book Bag with 3 Group of Silence Wheels This bag not only a trolley bag,and also be a backpack,just to remove when your child do not want a trolley With usefull pocket,can hold all of daily supplies that your kids need,fit for 14 inch laptop With 3 Group of Silence Wheels and Thick Spongia Strap,more effective to reduce pressure on back Ergonomic design,do not worry about too heavy to climb stairs,make of high quality nylon,also light weight Ergonomic design,do not worry about too heavy to climb stairs,make of high quality nylon,also light weight