Plan D Pocket Articulated Plus Box The Plan D Pocket Articulated fly box utilizes their patent pending design for storing up to 20 of your favorite articulated fresh or saltwater flies. (10 on each side) Simply slide the eye of the fly onto the stainless steel hook and insert the fly's hook into the slotted foam. The Pocket is the little brother to the Pack and the perfect box when you want to travel light. Flies sold separately