This water proof fly box system / case will work for multiple uses. (The interior panels are removable) Yellowstone Angler has assemble this combination with our waters in mind. Comes with the "Attractor" System Foam panel on one side.Perfect to store large fly patterns and large stone fly nymphs. The Fly case also comes with a threader system on the other side which allows you to place tippet through eye without removing the threaders from case. Lift threader holder to place tippet through threader and remove the fly for easy .No longer need to remove threader from fly case.Add spare threaders available separately to increase the capacity of flies to carry.●Includes: 5 Threaders・Long [Standard] ・Long [Midge] ・Short [Standard] ・Short [Midge] ・Short [Ultra Midge] Comes in two sizes: Small and Medium. Medium = 4 3/16" x 6 1/8" x 1 3/4" Small = 4 3/16" x 5 1/8" x 1 3/4"