Originally Posted by Tourist in MSN

I had a cheap Nashbar rack that I occasionally clamped onto my seatpost. It had a rubber spacer, thus there was rubber between the seatpost and the clamp. It worked ok with a rack top bag, but not so good with panniers.

If it was not balanced, meaning the same amount of weight on each side of the rack, it would turn on the seatpost so that the heavier side moved towards the center. I have a small pannier I often use as a gym bag, once I put that on it and I think I went less than 100 yards when the pannier support started rubbing on the tire because it rotated on the seapost.

Actually I had two of those racks, one with the lower pannier supports like on your rack, one without the pannier supports. The one without pannier supports could only be used for a racktop bag , but that worked ok because if it rotated on the seatpost, nothing rubbed. Photo below shows the one without the pannier supports on my road bike.



I agree with Yan, a Carradice bag would be ideal. But the US Dollar has lost a lot of value over the past several months, a Carradice Camper would be pretty pricey right now. Same with the Nelson Long Flap. I have a Carradice Pendle on my rando bike, photo below, I used a stem with appropriate shim to push the bag further aft so my legs do not hit it as I pedal. A couple years ago I bought a Camper to have for credit card touring, but have not gotten around to using it yet, at the time I got it the USD was much stronger so I took advantage of that and got it when it was much cheaper.