The Qbicle AQUAir system is simply a 'best in class' product. This amazing carrying system can hold 2 x bottle cages, 2 x CO2 cartridges, one CO2 cartridge inflator and a spare inner tube. The AQUAir system attaches neatly to the saddle rails via the steel/nylon clamp and the nylon body positions the carrying system just proud of the rear of your saddle. The angle of the system can be positioned by using the reach adjustment allen key bolt. The bottle cages are fastened securely each side using M5 8mm allen bolts. The cartridge inflator mounts directly to the upper red bolt on the system and the 2 x CO2 cartridges screw in directly at the bottom of the system. Finally you can use the Velcro strap to fasten your spare inner tube to the underside of the nylon body. The entire system is produced using highest quality materials and process making it strong and sturdy as well as being super lightweight given the job it does! This is a must for road training and also triathletes alike. PLEASE NOTE: Bottle Cages, Bottles, CO2 Cartridges, Cartridge Inflator & Inner Tube NOT INCLUDED.