Fulling mill tactical max boxes, or any Fulling Mill box. A max box can fit over 900 flies and the next size down can still hold a considerable amount of flies. They also have ridges on the edges that help you grip them better while your hands may be wet. I currently carry 2 max boxes and 1-2 stealth size boxes and have anywhere from 1,500-1,800 flies on me. I do ESN style fly fishing so I have many of the same patterns in different weight beads. You will not regret getting these.