Depends on how many racks I'm doing and what mood I'm in sometimes I do them individually and sometimes all together and sometimes I stack them all in a large foil pan and foil over the top. Some people say that stacking them will disturb the rub and others say it doesn't. My advice is to try it both ways and see which you prefer. Either way just don't forget to add some liquid to the foil packs before you seal them up