After announcing their plans to ban plastic bags earlier on this year, 67 Countdown supermarkets across the country will be single-use bag free withing a fortnight.
Bags will be cut from all South Island stores as well as stores in Napier, Hastings, Waikato and Auckland's North Shore.
To have an entire island phase out plastic bags is a "milestone", said Countdown general manager of corporate affairs and sustainability Kiri Hannifin.
"We're really proud to be continuing to lead the way for supermarkets in New Zealand when it comes to phasing out single-use plastic carrier bags.
"With our stores using on average around 6000 bags every day, the faster we can make this change, the sooner we can make a difference for the environment."
Over the next year the Government will phase out the bags nationwide. Retailers could face a $100,000 fine if they are found selling plastic bags once the ban is in place.