Topeak Tri-Backup Pro I Bike Bottle Cage Built to provide great water bottle hold and shave time of your triathlon, the Topeak Tri-Backup Pro I is a versatile and durable bottle carrier that will also hold other essentials for the bicycle part of your race. Strong and Durable Multi-Functional Carrier Mounting on the rear side of your seat post via parallel rail mount for aerodynamic, under-saddle positioning, the Topeak Tri-Backup Pro I can carry one or two 750cc bottles at a time, as well as host of Topeak and other compatible bags, pouches and cages to keep all of your mid-ride must-haves within arms-length. With two adjustable mount positions to suit your own reach, the Topeak Tri-Backup Pro I will keep your hydration, nutrition and peripherals comfortably at your fingertips.Features: Material: Pressed Aluminium Compatibility: Tri-BackUp Air Station, Tri-BackUp TubeBag, Tri-BackUp TyreBag, Ninja TC Road, Ninja Pouch+ Road. Ninja CO2+ Tri-Cage Bottle Carrying Capability: One or two bottles at a time (up to 750cc) Mount: Parallel rail mount Maximum Load Capacity: 2.5kg Weight: 97g Buy Topeak Accessories from Chain Reaction Cycles, the World’s Largest Online Bike Store.