MATMO Waterproof School Backpack Student Bag Bookbags for Teenage Girls and Boys Material: high density waterproof nylon; lining is 100% polyester High hardness buckle, high density breathable mesh and special zipper make this durable and convenient backpack for school boys and girls Adjustable padded straps have 3D relief air bearing system to protect students' spinal Can be used to place laptop, wear it when you have business trip, go outside or travel Dimension: 18.5"(H)*11.4"(L)*6.3"(W)(47cm*29cm*16cm)