I have one of the hardshell Axio's (don't know which one). I have had it for about 2 years, and it is the best backpack I have experienced for riding. For me, all of the non-hardshell packs tended to tug/pull in the wind. The Axio was perfectedly fine up to 150 (maybe higher...). The drawback is that they are not really big. I can fit raingear, extra gloves, a couple of school books (yes, even us old farts take classes), and a Jimmie John's sandwich, all with a little room left over.
I forgot, there was a chocolate chip cookie in there too, of course.