If you've been wandering around the supermarkets recently, you may have noticed that some green, blue and red caps are no longer on the shelves.
This is because supermarkets are trailing a change in a bid to make recycling easier, with the likes of Sainsbury's and Waitrose being part of the trials.
And with the new lids already having been a success during trials, some retailers are opting to make it a permanent - despite it leaving some people confused about what type of milk they are picking up.
