Hi - is this what you're looking for? The dye pack has 2 'tabs' at the opening end. One is sewn onto the mae west itself and the other is attached to the inside pointed end of the pocket flap. The flap is then sewn down to form a pouch around the pack. When you pull open the pocket flap - the dye pack is peeled open releasing the fluorescein. Picture courtesy of David Farnsworth.