Bottle cages - seat based

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Have been doing some longer distance rides in the country backroads with 2 water bottles and have found they're just not enough. Granted I can detour somewhere a little busier and call at a local garage but I'd rather not. Have been looking at seat based clamps so that I can fit more bottle holders.

Has anyone any experience of these? Can anyone recommend a particular make/model?
Does the clamping mechanism of the holder compromise the forwards/backwards movement of the saddle in any way?
 
this be the device you are after... http://www.topeak.com/products/Bottle-Cages/cagemount. RRP £5.99 IIRC
cagemount.jpg

Allows you to mount any bottle cage you want to a seat post (at any height) (assuming it probably should not be a carbon fibre one, but you will have to check that) or handle bars and then you can add any bottle cage you want.

We have used 4 of these extensively on tour. they are rock steady and never failed after 12 months constant use on and off-road. We had one one our seat posts and one on our accessory bars on tour for additional water bottle/fuel bottles. The seat post ones both took 1L water bottles/fuel bottles without issue.

It comes apart at the allen key bit at the front allowing you to rotate the clamp by 90 degrees for a seat post, btw.
 
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