Grease-proof paper bag and PE coated paper bags

Our food industry will often use grease-proof paper bags, usually food production companies will face the choice of oil-proof paper bags and PE coated paper bags, so what is the difference between these two products?

The similarity is that both can be used for food packaging, and both can be printed.

The difference is that the grease-proof paper bag is oil-proof, and the PE coated paper bag is oil-proof and waterproof.

However, the Grease-proof paper bag is more environmentally friendly than the PE coated paper bag, because the PE coated paper bag adds a PE film on the basis of the raw material, which is difficult to degrade, so the price of the grease-proof paper bag is more expensive than the PE coated paper bag.

Are you able to distinguish between these two paper bags? I will tell you if you want to know.