I have a 2.5 liter stainless steel airpot and a #6 coffee cone.
Another method that someone in our group uses is the coffee socks or pre-sewn bags as described in the link that Ron posted. Their difference is that they put the coffee sock in a kettle of COLD water the night before. In the morning, you just heat it to near boiling, and it's really good. Nice extraction, and really tasty coffee.