Mars bars have been given a new look with recyclable paper wrappers instead of plastic.
It is part of a pilot, trialling more environmentally friendly materials for Mars Food's chocolate bars.
The move follows chocolate rivals, Nestle, which has been using paper packaging for Smarties since January 2021 and on some Quality Street sweets since December 2022.
Nine of the 11 Quality Street traditional sweets moved to paper-based packaging.
The Orange Crunch and the Green Triangle remained in their foil wrappers as these are recyclable already.
Mars say it's a challenge to find the right paper packaging solution with an "adequate level of barrier properties to protect the chocolate".
In the Philippines, which sees tonnes of single-use plastics wash up on its shores, such packaging is repurposed to make bricks for building by being stuffed in to bottles and stacked.
Plastic straws were banned in the UK in 2020, with India following suit in 2022.
Meanwhile, France banned the use of single-use plastics in takeaway food venues in January.
Mars Incorporated said the change will make "200 million bars per year carbon neutral in the UK, Ireland and Canada".