Mortland said moving away from the small 200ml single-serve milk packs toward a 1-litre format was a sustainable packaging choice.
The option to shift to the more sustainable packaging was being offered to all 107 Bay of Plenty schools who participate in Fonterra Milk for Schools.
Bay of Plenty Fonterra farmer Brett Sterritt said the 1-litre pack was more sustainable as it did not use straws or plastic wrapping and it was not single-serve.
"It also allows schools to minimise milk wastage, by having more control over serving size."
WHAT IS MILK FOR SCHOOLS?
The programme is free for all Kiwi kids in any primary school that would like to take part.
Milk For Schools is now in 70 per cent of New Zealand primary schools, but more schools are encouraged to apply online.
More than 140,000 pupils drink milk through the programme every day.
Source - Fonterra