Rear carriers should not interfere with the air on the rider’s back, but instead fill in the turbulence ‘hole’ behind the riders posterior, thereby reducing the rider’s drag (which accounts for 64% of energy used on a racing bicycle). Xlab wanted the next generation of carriers to solve the problem of storing keys, cell phones, cash, tire levers, and other essential items. These and other items can be stored in the Xlab Rear Tool Bag which drops vertically and easily into the rear ‘luggage compartment’ and is secured by the top X-Strap. As you can see below, you have two choices for storing your CO2 cartridges and X-Inflator, or Xlab Speed Chuck on the rear of the Carbon Wing, using the optional hexagonal X-NUT or in the Xlab Rear Tool Bag. Tires and tubes are always an issue, so now you can attach them neatly under the Carbon Wing either inside the X-Rear Tubular Bag or without the bag. With the new Xlab Carbon Wing you can use a single X-Cage Carbon Boa Supergrip bottle cage on the rear or one on each side. These cages have no restrictive protrusion where the bottle enters the cage, instead the bottles are held in place with 4 proprietary X-Grip teeth between the two mounting screws. One of the key features invented by Xlab is the dual mounting holes for the saddle rail clamps. One position sets the bottle cages close to vertical and the other inclines the cages for rider preference. Because of it's past success, Xlab has kept the same feature in the Xlab Carbon Wing for customizing the installation. Xlab uses the latest carbon fiber composite with a special lay-up and resins to provide the toughest carbon carrier on the market. Without hardware the Xlab Carbon Wing weighs only 55 grams.