I need to refer to a selection that contains zero or more products. This will be used in a marketing email that displays some products for sale.
I consider the "selection" to be some kind of box in which I can put some products (no matter how many). To me, it's a "products selection", since the plural applies to the content of the selection.
However, I have found several occurrences of "product selection" on the Internet. These did not seem to refer to "the selection of one product", but to the same as in my case.
So what should I use: "product selection" or "products selection", and why?