More schools have sent messages to toy makers asking them to reduce single-use plastics.
The campaign is backed by children's environmental charity We Are The Voice.
In their latest post they wrote: "We have sent off our first petition from St Lawrence years 4 & 5 to 80 toy-makers, asking them to cut out single-use plastic wrapping and take back much-loved toys at their end-of-life to make into new toys.
"We want producers to close the loop. Let's see how toy-makers respond."
Unveiling the campaign last month the group said: "Parents will spend almost five billion pounds on children’s Christmas presents. But this will not be the true cost of Christmas.
"The true cost of Christmas will be the 25,000 tons of plastic wrapping, most of which will end up in our oceans.
"The true cost of Christmas will be the 226,800 miles of wrapping paper which gets thrown away -enough to stretch 9 times around the world!"
For more details about the campaign click here