The Elmsley count is more than a packet trick maneuver, it is a utility move that has all sorts of applications. You can conceal the number of cards, hide the front or back of a card, and use it to manipulate the position of cards within a group. It is also a great move in helping to create your own tricks. As a bonus, I have found that it has really improved my casual handling of a double card. Sort of a side effect I suppose, but a benefit none the less. With the Elmsley count and the Ascanio spread, you can get away with just about anything with cards separated from the deck.