With that rather small selection of gear, you don't need the very largest. That expands your options considerably. If carrying extras like food, water and spare clothing layers also figures in, check out the Adventure series from Tamrac. The largest (Adventure 9, I think) easily accommodates your load, along with good space for extras. It's best feature for me is that it still meets airline carryon restrictions.
If you're looking for a pack that also lets you stay in the field overnight, the choice of packs is suddenly more difficult. I rely on a conventional pack, but put my gear in individual belt pouches. The pieces in immediate use can be threaded onto the pack's waist belt or clipped to the shoulder straps for immediate access, while the remainder can go into the pack. The belt pouches provide protection while holding them ready for transfer to the pack's belts and straps. Neat, convenient, and not as expensive as the largest camera packs, which still won't hold your camping gear. Lowe, Think Tank, and Tamrac all offer belt pouches, and there are others.