Made of water repellent, durable, smooth and lightweight polyester for wear long time. Dimensions: 8.6L x 10.6H x 3.5W inch (22 x 27 x 9 cm).Small Size suitable for 2’11- 4’7??3-6 years old?? boys and girls. Adjustable Chest strap more comfortable to wear, suitable for running and protect kids’ shoulder. Double and cross stitching is used for easily tearable parts such as shoulder straps to make the product stronger. Simple and stylish backpack is good for schoolbag, casual daypack for daily use at school, lessen, and in various situations.