MATERIALS: • 100% Polyester. DETAILS: • Back pack capacity: 3 litres. • Hydro bag capacity: 2 litres. • Easy to clean thanks to the large cap. • Drinking straw with adjustable opening and closing valve. • Ideal for those who need a supply of water and want to replace the carrier with a back pack. • Removable pocket and trousse for tools . • Braces at X with quick release center and adjustments with 4 velcro straps. • Breathable fabric in the area in contact with the back.