That's the tip from The Nature School Primary head teacher Catherine Oehlman.

"It can be overwhelming to think about all the ways we use plastic in our lives," she said.

"Maybe your thing is a commitment this July to not use a single disposable coffee cup or ditch the Glad Wrap out of your drawer and try some other alternatives."

The Nature School community adopts an environmentally friendly approach.

A look inside the children's lunchboxes will reveal fruits, vegetables and healthy snacks which don't come from single-use packets.

"There is a real culture from our families that there is no excuse for single-use," Ms Oehlman said.

Plastic Free July encourages people to choose to refuse single-use plastics.

Ms Oehlman said Plastic Free July was a great way to get the message into the public dialogue.

"I think it normalises that way of thinking and being for people," she said.

Ms Oehlman said children could be change agents in our community.

"You don't have to wait to be a grown-up for your voice to be important or for you to have influence on the people around you," she said.

People should go to the Plastic Free July website for more information and to be part of the Plastic Free July challenge.

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