Movers ARE interested in which boxes will fit on one truck and which ones should be loaded onto others. They're concerned about finding the best routes, and they regularly communicate about road traffic and other obstacles. If a certain stretch of the highway is jammed with traffic, truckers will alert other truckers to take another route and avoid the area. You can sit at your computer for hours, composing the most delicious love letter of your life. Its job is to get the letter to your beloved.
Packets are the building blocks of the Internet.