Waterproof Aqua-Shirt, long-sleeve, from Victory Koredry  another fatigue saver from sun and saves core body temperature. Hoodie style keeps the sun off and is better than hauling a hat. Although a hat with a strap also works,  just another lose thing.

Basically, while you walk or climb you have your water things attached to your waist strap.

While you swim you attach your walking things to the strap always having 2 free hands.