Post packs as disributed by Australia Post are one of the most favoured means of collecting mint stamps.
They come in a protective folder with information pertaining to their history and source with Australian Antarctic Territories stamps from the Australian Antartic Division.
The Australian Antarctic Territory is the part of Antartica claimed by Australia and is the largest territory of Antarctica claimed by any nation. The claim is formally recognised by only four states, each of which also has a claim over part of the Antarctic. The area is estimated at 5,896,500 km².The territory is inhabited only by the staff of research stations. The Australian Antartic Division administers the area primarily by maintaining three year-round stations, Mawson, Davis and Casey, which support various research projects.
*All historical information taken from Wikipedia for educational purposes only