Has anyone any experience with the Profile aqua rack. In particular: - Can you fit it beneath a tool bag and still get the bag open without the rack being way down the seat post? - Are they OK to clamp to carbon posts? - I have a mini pump with a bottle cage mounts - kind of mounts alongside and beneath the cage using the cage bolts. Would this fit on the aqua rack to have the pump mounted there as well? - Any other comments?