This backpack is made from 100% Polyester and measures Height: 57cm, Length: 37cm, Width: 18cm. It features an Adjustable Chest Strap, Airflow Back System, Compression Straps, Curved Shoulder Straps, and is Hydration Bladder Compatible. For comfort, it includes a Padded Hip Belt and Raincover. It also has Walking Pole Holders. Compartments include a Boot compartment and Multiple Compartments. The total capacity is 40L. Please note that a Hydration Bladder is not included.