Best frame bottle for a P2

any recommendations for a bottle/cage to go on the downtube of my new P2? I have a profile design one for between the aerobars, but need a second bottle for longer rides

for training just throw a cheap aluminum cage on it, for races get a behind the seat holder
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any recommendations for a bottle/cage to go on the downtube of my new P2? I have a profile design one for between the aerobars, but need a second bottle for longer rides
http://www.invisciddesign.com/