I took advantage of PricePoint's free shipping (until Oct 31) and bought a Sette rear rack pak for about $8. It's a pretty decent rack bag that can easily be removed and strapped back on the rack. It's advertised as being insulated, weather construction, and includes a shoulder strap and a removeable key fob. Also there is a small inside pocket and a place to put a rear blinker. Not bad. I have a Sette hydro pak, and it has held up for I think 3+ years so far, so I think this bag will last just as long. Can't lose much for this price point. And, oh, it also looks nice...not too big and not too small as to be useless.