Plastic bottle tops are too small for the machinery to sort at the MRF and end up as part of the glass fines. It is best to put them in the red bin to avoid contamination.
Anything smaller than the palm of your hand is best added to the red bin – or contained in a similar product. Unfortunately we can’t do this with plastic lids, because they are a different type of plastic.
Metal bottle tops (from beer, wine and soda bottles) can be recycled by putting them inside a soup can (or similar) and squishing the lid closed.