But @factcheck found this figure is misleading…
They do not include any "bags for life" – which now account for a significant proportion (roughly 28%) of all plastic bags sold by supermarkets.
Co-op, M&S and Waitrose sold 58.8m bags for life between them, in 2018/19.
That’s a decrease of less than 2% since the year before.
Together, they sold a total of nearly 958m bags for life in just one year. Tesco sold the most (430m), while Sainsbury's sold 269m.
The idea is that customers will use fewer of them – so the total amount of plastic being used over the course of a year will be less. But reports suggest this is may not always be working.
"I haven’t yet reduced the total amount of plastic weight, even though I have eliminated 5p carrier bags."