An Eco Brick is an empty plastic bottle that is packed tightly with soft plastic until it becomes a strong building block.
The building blocks can then be used to make lots of things like walls, tables and chairs.
Eco Bricks are a way of taking the non-recyclable plastic out of the environment and out of landfill.
In school we use a lot of plastic wrapping. We have been saving it and packing into big plastic bottles. We hope to make some tables and chairs to use around school.