By Michael Lanza
Some ideas are so obviously better than everything that came before that the new thing just takes off: Many serious runners now recognize that the smartest way to carry water on a run—plus clothing layers and food on longer trail runs—is in a lightweight, streamlined, torso-hugging hydration vest. This review spotlights the best vests for trail running—how they differ in fit, comfort, capacity, and details—and offers expert advice on choosing the right one for your runs and dayhikes.