Ultra lightweight storage bottle mount system500ml storage space with wide open top for keeping essential tools neatly stored away inlcudes neoprene sleeve to stop anything from rattlingour cageless water bottle slots on to lightweight mounts 15g each that are secured to standard water bottle bosses the bottle is held securely to the mounts yet removed easily when neededinexpensive all in 1 solutionfeaturing a high quality bpa free bottle and 2 sets of mounts for use on multiple bikes th