The back of the bag is made of breathable fabric, which doesn't sweatSide pocket design, can hold water cups, umbrellas, etcAdjustable buckle, adjust the length according to the heightLarge capacity main bagThe ergonomically designed streamlined shoulder strap is close to the shoulder, which helps to evenly distribute the force on the shoulder.The large capacity design of the backpack has a main bag for storing work supplies, books and computers, and two side net bags for storing water bottles and umbrellas. With lunch bags, pencil bags can hold pencils and other daily and school supplies, and can also be used as wallets according to personal needs.