Waterproof Nylon School Backpack Schoolbags with Wheeled Trolley Hand Material:Oxford cloth,Polyester lining 2 in 1 Style: It can be a trolly or just a regular backpack by removing the rolling platform Large Capacity: 3 Main Bag,1 Front zip pocket ,2 side pockets,Main compartment has a padded laptop compartment Size: Width:18cm/7" Height:45cm/17.7" Length:31/12.2" ,trolley height 17" - 33.5"(adjustable) Max load-bearing 45KG, make the spine more health to grow and protect it from heavy weight Ergonomically designed breathable back and shoulder strap are made of ventilate material, can efficiently decrease crash impact and soft carry