Free: Contests & Raffles.
Kifaru, Mystery Ranch, and Stone Glacier are the top 3
Do you plan on "bivy hunting" or are you going to hunt out of a "spike camp"?
I pack fairly light and a 3400 cu in pack definately wouldn't work for a 7 day trip. I'd get one that is 4500 or larger if you plan on living out of a pack for any amount of time.Even if you aren't going to fill it up, just having the extra room in your pack is nice and it'll hardly add any weight to your hike anyway.
I have ythe kifaru duplex timberline 2. It is an awesome pack.