In brief, NCW means waste that is neither wrapped in a designated bag nor affixed with a designated label under "charging by designated bags/ designated labels".
For example, when a designated bag is used to dispose of waste, the waste concerned may be deemed as NCW if the bag is not tightly fastened, or if the waste is allowed to pierce through the bag.
Besides, any oversized waste (for example large furniture such as dining tables, bookshelves or mattresses) that cannot be properly wrapped in a designated bag will be considered a NCW if it is not affixed with a designated label when being disposed of.