Backpack is made of Water Resistant and Durable NYLON .Excellent craft manship, clean stitching and high quality metal accessories.Ensure a secure & long-lasting usage everyday & weekend. Dimension- Backpack size: 15"x 11"x 4". Large capacity and suitable for professional office workers, college students,high school students, boys, girls, teens, adults. Applicable occasions- This backpack is perfect to be a day pack,and Perfect for going to school, work, weekend get-away, biking, camping, gym, travel, etc. Characteristics- Comfortable airflow back design with thick but soft multi panel ventilated padding, gives you maximum back support.