Goods may be knock against ecah other or other things during transpotation. In consideration of consumer's consumption experience, the film is used to keep the products fresh and intact.
It's used to prevent the lid from scratches during delivery. It is not necessary to pay attention to these details.
The plastic film coated on the lid of thermos cup is a kind of packaging material for goods, used to protect the good from scrates during transpotation and sell. You should tear it off before using the cup.
