COMPONENTS: 95% Polyester 5% others DETAILS: Back pack capacity:14.5 liters Hydro bag capacity: 2.5 liters 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 bag Braces at X with quick release center and adjustments with 4 Velcro straps Breathable fabric in the area in contact with the back