I like the idea of chest/backpacks, but I have yet to find one that doesn't slide up to my chin from the weight in the backpack. Do they make one that stays in place on your back? I've tried 3 and they all do the same thing with as little as a can of soda and a small bottle of water packed in it. Add a raincoat and a few fly boxes and the tug of war between the front and back begins.
Bruce