Check out the KUIU Icon Pro Series Packs. They are made for hunters by hunters. I just picked one up to replace a Mountain Hardwear Maestro I have been using for backcountry trips for the last 7 years.

Would your trip into the Bob Marshall wilderness be your first backcountry trip? If so, that is very very ambitious. The "Bob" is an absolutely beautiful, virtually untouched and amazing place but it is also very unforgiving and quite a challenge for even the most seasoned veterans. I am not questioning your abilities Hillbilly, I am just making sure you are aware of what you are getting yourself into. Sounds like a super fun trip though.