Profile Design's RM-L system provides a sleek and aerodynamic way to address your on-the-bike hydration needs. The strong metal bracket attaches quickly and easily to your saddle rails. It has spots for up to three bottle cages of your choice. It even includes two lightweight Profile Design Kages to get you started. Placing your bottles behind the saddle creates a cleaner aerodynamic profile for your bike, resulting in time and energy savings over the course of your next Tri.