trolley laptop backpack

1,OEM OR ODM are welcomed. 2,it contain3 big compartments, one for laptop bag , one for A4 document,the other for other item. 3,soft material inside to protect your delicate notebook from impact. 4,unique confort and ergonomic shoulder tape and back side , to spread the shoulder and back pressure, walking in ease, make your spine more healthy. 5,extra material on the bottom. 6,reinforced carrying handle. 7,shoulder tape and trolley can be hidden and concealed easily, when you don not need them. 8, adjustable shoulder tape/strap.