"This move is the result of ongoing work to incrementally review our packaging as part of our commitment to help people manage their intake of sugar and consume the right amount for them."
Mason's comments followed a refusal to comment by Coca-Cola Amatil (CCA) spokesman Neil Waka yesterday.
CCA is the bottling partner for Coca-Cola in New Zealand and a separately listed company.
Waka said yesterday he would not be commenting because CCA didn't have to.
Today another CCA spokesman, Steve Inch, said it had lowered its recommended on-shelf price for the 330ml multi pack cans.
"We don't set the retail pricing therefore you might see some variation from store to store," he said.
CCA couldn't say specifically how much it had recommended the price drop by due to commercial sensitivity.
The new size cans were on sale in multi-packs at New World and Countdown, and both supermarkets were selling the old size cans at a discount online.
A Countdown spokesman said it did not influence can size and the supermarket was "currently in discussions to ensure we have the best prices we can for customers".
Foodstuffs, which owns New World and Pak N Save, has been approached for comment