I bought a Boblbe Megalopolis Aero. I have all kinds of other backpacks and messenger bags and I like this the best. I have been using it everyday since I got my S3 and it is an excellent backpack. The other fabric packs I have tend to shift around a lot and tend to flutter at speed even when properly adjusted. The hard shell stays put and is extremely comfortable (even if it does look like a jet pack

)
Axio also makes a nice hardshell, but the Meg Aero is a TUV: certified back protector when you use the waist belt.
Edit: I was able to get mine in white to match my bike by ordering directly from Boblbe USA.
[ This message was edited by: w00ht on 2007-05-01 11:48 ]