Getting the bottle out while riding will be a non issue. I nearly hate to admit the things I've done while riding... adjusting helmet straps, cleaning glasses, checking weather radar on phone, transferring contents of my bottle to someone else's.

thanks for the complements. To be honest, I've never been overly drawn to colnagos but this one spoke to me. Joe Bell really made this one special.

This doesn't surprise me. The design looks very subject to the shape of the saddle rails. Fortunately, it looks like it was made for this saddle. The low profile rails give it no where to go. I have to completely remove one bolt and loosen the other a long ways before it will come out. I could see it sliding out of a taller saddle if the bolts loosen. It may be a pain, but you could put a locknut on the back side of the plate.

750ml-800ml seems to be max for a good bottle. Throwing another 500ml out back will be nice for longer rides.

this is my number 1 concern. Behind the seat hydration has a reputation for ejecting but I think a lot of it has to do with the cages a lot of these people use. I plan to test on early spring solo rides. If I loose a bottle I will look at using a rubber band or something to strap it in. I would have to get off the bike to switch the bottles, but it beats dehydrating 10 miles from home. I've done it, and made it, but it wasnt fun...