DIY Help - rear mounting a cage to an aero seatpost

just lash the bottle under the seat with a velcro strap (used for organizing electrical cables…available at any Target or Home Depot).

http://farm3.static.flickr.com/2567/4204782025_3c22a00dfb.jpg

Here’s the flat kit inside the bottle:
http://i27.tinypic.com/2v7wif5.jpg

Have you heard of saddle bags?
Available at any bike shop!

M@TTY