Barrel length is important in the discussion. I've used a racket bag or a larger Kelty back pack as experiments. My guess is three day pack will be a tight fit for anything longer than 7.5" barrel based on my experience.
Sneaky bags are the top of the heap along with conventional back packs. 5.11 is not tier one, but functional.
Not the most sneaky, but the Bulldog case is racket bag inexpensive and heavily padded -
http://www.youtube.com/watch?v=LbadiWIivjM
One question for the OP is whether you want something fast draw - back packs not designed for rapid access are going to be slow in many cases. YMMV.
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