This is a SIERRA DESIGNS one-shoulder bag. The material is a high-strength ripstop fabric. The back is mesh, which reduces stuffiness and allows for comfortable wear. It has a convenient mesh pocket on the side that can hold a water bottle, etc., and is a great size for everyday use. Size: Actual size: Height 50cm, Width (maximum) 35cm *Please note that there may be slight variations due to manual measurements. There is some minor wear and tear, but no noticeable stains or damage.