New Zealand Post is launching the KiwiStamp, which for the first time does not carry a face value.
The stamp series features imagery reflecting the New Zealand lifestyle, Postal Services chief executive Peter Fenton said.
"The KiwiStamp holds its value even if postage increases," he said.
"It works in exactly the same way as a postage included envelope. Even if postage increases, customers can use the KiwiStamp without having to buy additional stamps."
The new stamps feature 10 images including a State Highway 1 sign, a kiwifruit, summer holidays in a caravan, beach cricket and a number 8 wire fence.
Existing stamps would remain valid at their face value and commemorative stamps celebrating New Zealand, its people and culture would still be issued, Mr Fenton said.
There would be no increase in domestic postage this year, but one could not be ruled out in the future, he said.
The KiwiStamp was designed for use on domestic Standard Post and FastPost letters but could be applied to make up postage on international items and domestic parcels.
One KiwiStamp would cover the postage of a Standard Post medium letter domestically and two would be needed to send the same letter FastPost.