I have the Dwight Schuh backpack by Fieldline. It is a large backpack with a front compartment that zips down and holds all your hunting calls, clippers, etc. A little expensive, but well made. Bought mine at Bass Pro for $80.

I take a lot of stuff for a half day hunt..fairly big digital camera, cell phone, bino's, gps, termacell, snips, lure..etc. no liquid or food.. but it all goes in my little fanny pack. I buckle my fanny pack to one side of stand and my digital camera I carry across my shoulders and just hang on the other side stand.