The Side Pocket Delta is a double-width pocket designed to provide greater outside storage with a larger pocket. Installs onto any two side-by-side attachment bays. Even bridges the gap between two modules. (This just means that, for example, if you zip a CS5 onto the rear surface of a CS4, you will be able to make use of the two side-by-side pocket mounting stations and place a SIDE POCKET DELTA across the gap between the two modules.)