51 cm Cervelo S5 - large bottle on the seat tube?

Will it fit? I have a 54 cm SLC-SL and am thinking about switching to a S5 but may go with a 51cm to get the shorter head tube. I am curious about being able to ride with 2 large bottles on the frame though.

Thanks in advance, Jeff

I would think with an arundel sideloader type cage you should be able to run two large waterbottles on most any frame that has two sets of waterbottle bosses inside the triangle.