Replaces the Frame Bottle! Standard frame-mounted bottles have high aerodynamic drag, so place your bottle at the rear instead. The DELTA are mounted on the saddle rails for no measurable drag.
Use the DELTA to refill a front drink system. Just bring the spare bottle forward from the DELTA and refill. If you have the popular XLAB TORPEDO aerobar mounted system, simply replace the empty front bottle with the spare bottle from the DELTA.