The Detpack is a charge of explosives used by the engineer class of regular infantry, as well as Boba Fett and Han Solo. The charge is set off remotely via comtroller, and the detpack itself can be stuck onto any surface or vehicle. This attack is very useful for taking out things with a lot of health, and is the most controlled of all the explosives on the game.
Because of the fact you drop it, the detpack is most effective against slow/immobile targets, and for setting traps.
Though you can only have 1 out at a time, if you have one deployed and die before it detonates, if you respawn as a class with detpacks, the currently deployed one will remain on the field.