【Size Information】Rolling backpack for kids 18.92'' high, side to side width 12.87'', front to back depth 8.27'', lunch box is 10.3'' high, width 10.3'', depth 7.5'', the backpack size is available to carry on to the airplane no necessary to check in when travelling,the wheels are equipped with a cover keeping it from dirty, the cover is hidden in the zipper pocket above the wheels. 【Multiple Compartments】Tilami rolling backpacks have remarkable patterns popular with kids and impressive designs, high quality fabric, and big storage capacity up to 35 Liters, sorting your belongs by different compartments. 【Reduce Back Stress】Research shows that the weight on the shoulders of American teenagers before age12 should not exceed 10% of their own weight, while after age 12, not exceed 15%, Tilami wheeled book bag for school will effectively reduces back pressure, making it easier for school or travel. 【Quiet Wheels】Wheeled backpacks for boys make very low noise 40 dB on the floor, Tilami armor bottom protection system is water resistant and low temperature resistant up to -4 ℉，at least 30lb bearing with high-strength aluminum alloy rod, but do not wobble the rod. 【Shoulder Strap & Concealed Pockets】Tilami unique design of shoulder straps make your wheeling time more convenient and fun, please put the straps into the back concealed pockets when you pull the backpack on the ground, Tilami rolling backpacks fit for kids over 4 year-old. 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.