At what level is the use of UDI no longer applicable, with regards to individually packaged items and items packaged in a single container?

In the case of individually packaged items, where each unit of use is individually packaged, a UDI is required on the packaging on each item.
In the case of items packaged together in one container where the unit of use is not individually packaged (e.g. a box of surgical gloves), only the outer packaging requires the UDI, not each individual item.