polyester liningZipper closureSize of Boys Rolling Backpack: 11.8"x 9"x 18.11"(L*W*H); about weight: 2kg; the rolling backpack with durable rubber solid 6 wheels design, sliding fast, not stuck, wear-resistant, the wheels are perfect for going up steps and curbsMaterial of Rolling Backpack: Anti-splash water nylon fabric, lining is polyester, durable, anti-scratch, and water-resistant, better protect the items in the kids backpack from getting wet, and easy to wipe down. This boys rolling backpack with sturdy zippers, triangle sewing reinforcement, adjustable padded straps and durable wheels and handles, can last the entire academic yearRolling Backpack with Multi-Pocket: Boys rolling backpack with multiple pockets, 1 large capacity main pocket with compartment, 3 front zip pockets and 2 side pockets, easy to hold all for school supplies, such as tablet, books, homework folders, iPad, folded umbrella, water bottle, ect.Detachable 6-Wheel Trolley: After correct assembly, the backpack can stay on the trolley stably without rollover, wear-resistant rubber wheels, reinforced aluminum alloy double handle, telescopic design can save space. you could use the backpack with the trolley or trolley can be separated use if desiredOccasion of Trolley Bag: This rolling backpack perfect for school, travel, work; it is suitable for primary middle high school kids and adults. Please contact us if you have any questions or dissatisfied, we will refund or replacement to ensure you a beautiful shopping experience Product Description Dear Friend , You Have 3 Options, Please Choose Carefully Before Purchasing ! Kids Backpack Size: 11.8"x 9"x 18.11"(L*W*H) / 30 x 23 x 46 cm Dear friend , you have 3 options, please choose carefully before purchasing ! 2 Wheels Trolley + 1* backpack6 Wheels Trolley + 1* backpack6 Wheels Trolley + 3 Pcs sets (1*backpack,1*lunch bag,1*pencil bag) Boys Rolling Backpacks Kids' Luggage Wheeled Bags Kids Trolley School Bags Book bag with Lunch Bag & Pencil Pouch Large Kids Backpack Set + cartInsulated Lunch BagOccasions: suit for boys to school, shopping, travelling, camping etc. as school bags, everyday back pack, casual rucksack. Please complete the assembly when you receive the package, please refer to the four installation steps. Step 1. Get the handle and base readyStep 2. Remove the screw from the handleStep 3. Insert the handle into the 2 holes on the base and use screws to fix themStep 4. The trolley is assembledFinal Steps : Pass the backpack through the lever handle, Then fix the buckle of the backpack to the slot of the base. How to choose a 2-wheel or 6-wheel trolley? Ordinary 2 wheels are suitable for flat roads. It's very convenient for your child who go out for a trip or go to school with heavy belongings.Durable 6-Wheel makes it easy to adapt to a variety of terrain, also convenient for your kids to carry it during climbing stairs. Adjustable padded shoulder straps strong kids book bag ,perfectly stitched, full of pockets and great zippers.Cute galaxy printing, apply to primary school and middle school students, for school, travel and other outdoor activities. Water proof, spill proof, and easy to wipe down,spacious.Sturdy back pack with lots of pockets for easy organization of all kids school supplies.Durable lightweight polyester material, which is perfect as daily backpack, school backpack or travel bag. Durable Gender Unisex-Child Unisex-Child Girls Unisex-Child Unisex-Child Unisex-Child Backpack with Wheels Backpack with Wheels Backpack with Wheels Backpack with Wheels Backpack with Wheels Backpack with Wheels Backpack with Wheels Wheels 2-wheel / 6-wheel 2-wheel / 6-wheel 2-wheel / 6-wheel 2-wheel / 6-wheel 2-wheel / 6-wheel 2-wheel / 6-wheel