Tilami rolling backpack is a revolutionary wheeled bag designed specifically for school use, and is sturdy, ergonomic and practical. It was designed by parents who got tired of seeing their children carry too much weight in their backpacks, and of badly designed wheeled bags that break easily long before the school year is over. - At least 30lb bearing with high-strength aluminum alloy rod; Multifunction usage with Tilami armor bottom protection system - Big storage capacity with large multi-compartment design can hold more belongings, save your shoulders effortlessly - Personalized design of shoulder straps padded pocket make your wheeling time more convenient and fun - Completely new patterns could be suitable for different occasions, such as primary school, high school,college, nursing school, vacation,trip and so on - This backpack fits for kids over 4-year-old. Water can not soak through, all products from TILAMI have received so many and highly recommends across the board on Amazon over past 3 years