Somebody mentioned that shimming the bag on the rack to stop the rattle ultimately damaged the clipping mechanism. Stifling that rattle is already on my To-Do list (and I don't even have the bag yet), but I'm going to be very careful with what I use.

As far as forgetting the cost, that's what happens to me with every item I buy that turns out to be a "winner." The shock of paying for it always goes away after a month or two.