The law also covers bags made of plastics that are degradable, biodegradable or oxo-degradable.
It comes as the Government also spends $40 million from its Provincial Growth Fund on crowd-sourcing ideas to reduce the amount of plastic waste in New Zealand.
So is this pointless symbolism, or the first step of many needed to change the unsustainable way we're living?
For the latest Front Page podcast I talked to Herald science reporter Jamie Morton about what the ban impacts, the science behind it, and what conservationists say needs to happen next.
I also talked to Herald lifestyle reporter Rebecca Blithe, who is attempting to go plastic-free, about how that works in the realities of modern life.
For the interview, watch the video podcast.
If you want to know how Rebecca's challenge goes, keep an eye out for the final results in the July 15 edition of Be Well, in the Herald and online.
If you have questions about Herald investigations, or want to stay up to date on social media, you can find host Frances Cook on Facebook here, Instagram here and Twitter here.