I've already got a 5500, which is too big since I've never been on a hunt more than about 6 days packed in. After looking at all the specs for the 2000 bag, my brain says I can get 3-4 days out of it. Curious if anybody has used the 2000 for overnight or multi-day trips, how many days can you get out of it??? (I'm interested in what you can get just in the bag. I realize I can always gypsy pack it.)