Anybody us any of the bottle holders that mount under your seat (Profile Design Aqua Rack or Xlab Mini Wing for examples)? They're big with triathletes and was wondering if it's a viable option for carrying more bottles on gravel. I have read that a few models are a bit flimsy and will launch bottles, even on pavement.
My wife is 4'11" so her frame bottle options are VERY limited. She runs the rear carriers on all her bikes (4). The fancy x-lab ones are very rigid and seem to be the worst for trying to throw bottles. The Minoura double mount seems to flex more so the movement seems to soak up the hard hits and doesn't throw bottles as much. One trick we learned is to loop a rubber band around the cage and then over the top of the bottle. This gives it just enough force/ twist to hold it against the cage. Once you have drunk half the bottle, they don't pop out as much, so you don't have to worry about getting the band back on when riding. She uses the Profile Design Kage. These aren't too expensive and hold pretty well. Biggest drawback is that you look like a triathlete!
