It all depends upon the situation. If I am going to be within 1/2 mile of the Jeep and/or moving for most of the day, I wear a fishing shirt with box in one pocket and camera/tippet in the other. I used bead chain to connect my nippers to my forceps and pinch the forceps on my shirt.
If it is a long day or long walk out, I use the same setup but I add a camo Camelbak pack for water, first aid/survival gear, lunch, rain jacket and any extra boxes or gear. A net hooks on it well if I am targeting larger fish and it fits so tightly to my back, I don't even notice it.
Saltwater, I wear a fanny pack for the water bottle, mostly.
I don't like a pack hanging on my chest.