Book bags are flexible, lightweight bags designed for carrying books or other educational materials to and from school. Book bags come in many different styles, sizes and colors, nevertheless the most commonly used design are backpacks which features a sack with side pockets, padded shoulder straps as well as additional reinforcement to hold textbooks.
About Mesh:
Mesh refers to a material that is netted and is punctured with minor openings. Mesh is typically found on athletic and casual footwear to provide comfort and breathability.