I'm a vest guy.
I travel light but like the convenience of all the pockets on a vest.
I have a fly box, several spools of tippet (4X, 5X 6X 7X), hemostats, clippers, a small flashlight, magnifying glasses, polarized sunglasses, my net, pocket knife, a couple cigars, a couple spare leaders, tie fast knot tool, floatant, pocket camera. If I'm going to be far away from my car, I'll carry a bottle of water, some snacks, and some toilet paper (only had to use it once, but it sure did come in handy).
I guess there is other stuff I could carry and do have some pockets on the vest that are empty, but I've never been on the water and been without something I needed.