My wife and I switched from plastic to insulated stainless steel Camelback Podium bottles. They are heavier, but we don't care. It's really nice to drink ice cold water three hours into a ride. Hitting a pothole or rough railroad crossing at speed can bounce one out, but preventative measures can be taken. Slowing down while approaching the bump is the simplest, but a micro bungee wrapped around the bottle neck can work, too.