Plan D Pack Articulated Plus Box The Plan D Pack Articulated fly box utilizes their patent pending design for storing up to 20 of your favorite articulated fresh or saltwater flies. Simply slide the eye of the fly onto the stainless steel hook and insert the fly's hook into the slotted foam. Equally at home in a boat bag or stuffed in the top of your waders, this is the box you need. Plan D Pack boxes are built with high quality components and a weather-resistant seal. They offer both clarity and durability and will keep your flies secure and dry in the harshest of environments. 9.54" x 5.22" x 1.41".