Ok, so I've just bought a (very cheap and slightly heavy but functional) folding bike. Unfortunately the panniers I already own hit my heels when mounted, so I've removed the rack. I'd really like to get something using the Carradice SQR system to mount on the back of this, rather than using the rack, because from what I can see almost all of the weight will be removed once the bag is taken off. But I'm having a little difficulty justifying the cost right now.
Does anyone think that some kind of system could be rigged for a single pannier, so it hangs behind the saddle with the base up against the seat post?
Or alternatively, help me justify the cost of the Carradice stuff! :) I don't think it'll transfer well to the Trek 1000 I commute on, or I could justify it easily...
(The bag I'm looking at is http://www.evanscycles.com/product.jsp?style=12045 this one!)