Until now, there was no good box to hold a bunch of unruly intruder-style flies for steelhead outings. After a period of deep thought, intense concentration and round-table discussions with Cliffatarians, the guys at Cliff decided that a memory coil system was just the ticket. Simply back the stinger hook into their time-tested blue material and place the head of the fly under the memory coil. Ta Da! Problem solved. The is THE box for the intruder-style flies (it holds other flies too).