Originally Posted by
datlas
2. If you forget your bottles at home, you can't borrow or buy any old bottles. With cages, you can borrow from a friend or even put a coke or generic water bottle in there.
3. If you drop or launch a bottle, you are similarly screwed as in 2 above.
This is why I have eschewed aero or other boutique bottle designs. There is a LOT to be said for being able to stick a borrowed bottle in your bottle holder, get a cheap replacement from the LBS or even Wal-Mart if you're traveling, or being able to stick a gas station bottle in the holder.