Alpinestars Faster Back Pack 81% Polyamide 19% Polyester Imported 18L capacity. Main chassis constructed form durable rip-stop nylon with PU-reinforced textile. Mesh shoulder strap and back reinforcements for improved airflow. Waist belt, plus adjustable sternum strap for secure fitment. Sternum strap incudes whistle to attract attention. Main back protector compartment to house level 2 CE certified back protector (incorporated). 18L capacity; Main back protector compartment to house level 2 CE certified back protector (incorporated) Additional main compartment for hydration pack (sold as accessory upgrade) Full face helmet strap, Pack away open face helmet carrier LED light strap is reflective for improved visibility