· High-Quality Material: The Backpack made of high-quality nylon waterproof fabric. Lightweight and comfortable for kids to carry books and related items. Water resistant, wear-resistant, durable and easy to clean. The trolly bar are designed to carry enough weight and easy to pulled on the way. Hand wash only. · Suitable Size: The backpack size: 18.11 "H x 13.4 "W x 7 "D, Lunch Box: 9.8 "H x 7.1 "W x 5.5 "D; Zipper Pen pouch: 4.3 "H x 8.3 "W, Backpack weight: 1.60 lbs., Wheels weight: 2.86 lbs. Suitable for a variety of items, such as Books, computers, clothes, and other small items. · Comfortable: The Trolly backpack has shoulder adjustable padded straps and handles that can use as shoulder backpack without trolly. It?s convenient and easy to put on the shoulder and save the time. After correct assembly, the backpack can stay on the trolley stably without rollover. · Storage capacity: The 6 wheels boy trolly backpack is design and convenient to carry what you need. The lunch box can use to carry your food and keep it safe. Zipper Pen pouch can carry pencils, pens and Crayons. Multipurpose: This rolling backpack perfect for school, travel, work; it is suitable for primary, middle and high school kids and adults. The age of the boys can use it is 5 years and up.