I had a seatpost mount rack briefly. You'd be surprised at how quickly the weight adds up when you count the bag you use, and a few things you want to carry. It kept moving around even though it was as tight as it could go. And it felt unstable. I got a Topeak Explorer rack (built for disk brakes) and I love it. I don't notice it when I ride. It can take much more weight than a seatpost mount, and the bag doesn't get in the way of my saddle. YMMV.
Deb
PS If you really want to try a seatpost mount, I have a Bontrager I could send you.



I am trying to decided between a seat-post mounted bag and a rack with a small trunk. Panniers are nice, but they seem more expensive (aren't 2 of them needed - or my misunderstanding?)
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Keep it under 3#. A map pocket is really nice to have, especially if you don't have GPS.

