I have one very much like this one:
http://www.cabelas.com/product/Hunti...3Bcat104392080

Not that one exactly, but close. It does everything you want. large central pocket for all kinds of food etc, smaller pockets around it for camera, calls, water, straps to tie on things like extra layers, warm back, umbrella etc.

I can easily carry more in than I need for a full day.