In card magic, the concept of “packet tricks” has always been an exceptional and independent existence.
A packet trick or packet effect usually uses only a few cards, and not the whole deck, which makes it easy to carry around.
On the other hand, packet tricks can also polish your card magic, allowing you to significantly improve your sense of magic at a much lower level of difficulty. More importantly, a good packet trick usually has an interesting presentation, allowing it to express much more than what the cards themselves can.