I'm looking for a good bottle holder that clamps onto the rails of a saddle instead of the seatpost. my velcro one for the downtube is too effing scary, big pothole = slides over = in my every pedal rotation. that's happened at least 10 times over the course of owning it, no matter how tight I strap it, and it's scary every time

had the seatpost one too but I like carrying a little bag back there for tools so I don't have to carry a bag on me.