Plan D Pocket 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. 6.59″ x 5.22″ x 1.41″. The Plan D Pocket Standard is a great all purpose slotted foam box for medium to large fresh and saltwater flies. The Pocket is the little brother to the Pack and the perfect box when you want to travel light.