【Rolling Backpack Dimensions】: 12.60(L)*7.87(W)*17.72(H) inch/32x20x45cm (the size is for the backpack, not the trolley). Large wheeled backpack for school boys, girls,no matter you are a primary school students, junior or senior high school students 【Detachable Roller Bag】:This wheeled backpack includes a trolley and an ordinary backpack, it is detachable. 6 wheels for climbing 【Unique Cartoon Design】: This cartoon school travel rolling backpack is a perfect gift for kids. With the backpack, boys and girls will love to go to school or travel 【Breathable, Lightweight and Waterproof】: The kids rolling backpack is with breathable material and ergonomics designs to reduce the pressure of the student's back, it's a good choice for children to school 【Comfortable】:The thickened S-shaped sponge shoulder straps can reduce children's pressure