Silent shock-absorbing wheel, built-in spring design, so that the wheel can reduce vibration during use.Large-capacity space design and storage in an orderly manner.It can meet daily needs, it is not troublesome to go out, and travel lightly.Convenient metal buckle, 21-inch large capacity.The second gear lever can be adjusted freely.Material: Leather46*35*21cmPackage Included:1 * Backpack