Yesterday a group of pupils delivered about 100 reusable bags to New World Gardens to start a ''bag library''.
Dunedin North Intermediate sewing teacher Julie Butler said every pupil at the school had been involved with making the bags, which took about four hours each to sew.
Pupils from the school's environment group sacrificed lunch breaks to ensure there were as many bags as possible.
Pupil Lina Fraser (12), said she believed it was important people stopped using plastic bags.
''We've only got one world and we need to treat it with respect.''
The pupils encouraged other people to donate reusable bags to the library which was located inside the entrance of the store.
Supermarket owner Brendan Murray said the pupils pitched the ''great idea'' to him.
''People often forget to bring their reusable bags, so it will work well.''
The success of the library was dependent on people returning the bags after they had unpacked their groceries, he said.
The pupils would continue to make bags for the library because they expected demand for them would be strong.
