Thanks Canonnoob, I'm stoked about this coming summer I think the first place I may go is to Egypt
to shoot the spynxe and the pyrimids.And by the time summer time comes I should be fit enough to wear this bag and walk for miles.
If you're going to shoot the spynxe, you may have a hard time finding it...its actually the sphinx. 
As far as camera backpacks go, the Tamracs will carry a lot of camera gear, but that's about it. I have the Expedition 7, so I'm speaking from experience. Plenty of room for gear, but basically no room for much else unless you want a lot of things dangling from your pack.
I just got back from a week in the Tetons, and I used a Lowepro Rover AW II. TBH, I couldn't have had a better camera backpack unless I opted for a 'real' hiking backpack. The AW Rover has two compartments...a lower for camera gear, and an upper for other necessities, such as food, rain gear, or other necessities.
In the camera compartment, I had a 70-200/2.8L stowed vertically, a 24-105L, 30D body and 5D body (with their attached L-brackets), and three manual focus lenses (Oly 21mm, 24mm, Leica 35mm) plus their hoods, along with a RRS panning clamp. In the upper compartment, I had a GoreTex rainsuit, pack of beef jerky, energy bars, hoods for the two Canon zooms, CF card wallet, filters, emergency blanket, and a few other odds and ends. The Rover also has a tripod attachment setup as well, plus two elasticized slips for water bottles (can hold up to a quart-sized nalgene bottle in each), and an additional two small zippered pockets.
I used my Expedition 7 a few months back on tour of the southwest, and its shortcomings became a real nuisance, especially in the heat. Hiking for miles with nalgene bottles dangling from the waistband, and banging you with every step, was a PITA. As I said, it holds a lot of gear, but really nothing much else.
As a long-time shooter, I've been through enough camera backpacks over the years. I'd recommend taking a look at the Lowepro Rover from a utility standpoint (unless you really want a gear pack only).
