For his birthday celebration, Nick has challenged his friends - Yulee, Sally, Pedro and Martin - to spend the day without using any single-use plastic. This means they use their own cloth bags for shopping, they say no thanks to plastic straws and, instead of balloons, they decorate with kites and streamers made of natural materials. The children discover that not using plastic is not that hard. They also learn about what plastic is made of, how much of it surrounds us and how it's polluting our oceans and affecting the food chain. Most importantly, the five friends learn ways to use less - including just saying NO! The book concludes with fun ideas for readers to do a No-Plastic Challenge of their own!