Pu Waterproof School Bag with Three Wheeled Trolley Hand Detachable Backpack 600D Nylon Imported Telescopic rod length: 90cm,3 high wear-resistant rubber pulleys Portable: 3.8cm 3D honeycomb breathable thick, comfortable, solid Base: added two vertical legs, using them to stand up when not tilt or topple forward Size: 14.6" x3.94 "x17.7" inches; 37X10X45cm Chassis Size:11.4"x6.3"x1.57",29x16X4cm (L*W*H),Large enough to hold A4 magazine, cell phones, wallets, books, etc