I have that pack also. I can fit everything for a 5-day hunt trip no problem. Its bigger than it looks. The only thing that gets tricky is my sleeping bag, but I just lash it to the top with some rope. I roll up my little thermarest and strap it uner the bag too.
I go tent-less, but carry a nylon 10' square tarp for a diamond shelter, so that may be a little smaller too. Food is the space killer, but its gone for the hike out so thats easier too.
My only gripe is that everything in that main compartment is lumped together, but for packing meat it looks great ( I have yet to kill aything on any of my few pack-in hunts), so its a minor gripe.
I usually have a really small day pack or larger possibles bag that I have all the stuff I need for hunting forays that I strap to the outside of the main compartment. That way I can hike in, pull off my day bag, and go hunting without having to dig around in the main bag and forget something that I need for hunting.
As an aside...that pack is great quality! not a scratch after several trips. For the past several months its had a 50lb bag of sand and a dumbell in it too as I get ready for my elk hunt this fall and it doesn't even know its there! No popped seams, no lose straps, still supportive as the first day.
Jim