What kind of material is the express package on the market now? It's dark in the outer grey.
It's a special packing bag for express delivery. That kind of paper bag, like post office, is specially designed to pack the things you want to express.Wrap things up and seal them in a bag.Some sellers or buyers need such bags when they are delivered. Some express to the seller to buy money.
The materials used for express bags are generally HD-PE, which can be recycled and can be re packed into bags
