The bag of hops that's supplied with the Brupack kits can be used to give a more bitter flavour with a long boil and added to the wort. To increase flavour with a short boil, or added to the secondary fermenter/barrel to give a hop aroma.
If the bag has been initially boiled to add bitterness or flavour can it also be kept and added to to the fermenter for aroma, or is considered used ?
Hop "Tea bags"