Previously posted threads haven't quite slaked my thirst for backpack knowledgezzzz

There's lots of talk about messenger bags, but not about backpacks. I'm looking for a bike-specific, high-capacity bag along the lines of the so-good-it's-criminal Vandal. I like the expandability and the extra cargo straps for dag-nasty bike-hauling skillz.

However, I'd like to spend a little bit (a lotta bit) less than $240. Is it possible?