Polyester Scientific and reasonable capacity: The size of this shoulder bag is about: 7.87×2.75×9.05 inches. Multiple pockets and rooms can make your things more organized, and the capacity of this bag is large enough for 9.7 iPad, small notebook, wallet, cell phone, keys, and other small stuffs. Main material: This messenger bag is made of lightweight polyester, durable enough and comfortable to touch. The weight of this bag is about: 0.83 lb. Adjustable shoulder strap: We can adjust the length of this bag’s shoulder strap to fit our body, and make our trip or daily using more comfortable. Waterproof: The material of this shoulder bag is waterproof, and can keep your valuables away from wet. 100% Customer Satisfaction: We offer 3 months return policy. Any quality problems with your bag, please feel free to contact us, we will solve it.