I've used an X-Wing behind the seat carrier for years. They have both the kind that mount on the seat post (if non-carbon) and on the saddle rails (if post is carbon).
I put 2 cages on the X-Wing, plus velcro'd my spare tubes to it. I use the light profile design cages. Stil room for a little under-the-seat bag.
I found it much easier to reach behind for a bottle... putting it back took a little practice
P.S. I was told by my old LBS to NEVER use any clamp thingies on a carbon seatpost... in case you was wondering.
spazz




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