Is there a particular reason you are looking at a backpack instead of panniers? Panniers are more stable because the weight is lower, and the bike holds the weight instead of you, which is alot more comfortable.
Arkel makes nice panniers, including a backpack-pannier called The Bug. Made in Canada.





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I liked what I saw at both Gregg's Cycle and REI in Seattle when I was up there. I'd go there and see what they have and how they feel. 