In order to save money, courier companies generally use computers to count the flow of several express mails collected on the same day, and first choose a few places with relatively more express mails as the first delivery.

In this way, after the express mail is packaged, it is first transported to the place where the express mail is relatively concentrated by air express, and then delivered again by the express company through its own subsidiary. If the volume of express mail is too small, the courier company may choose to send a single express mail to the postal courier, or inquire whether the courier in the same trade has delivered it to a certain place, and if so, hand it over to the colleague for two-way delivery.

Therefore, we often encounter that the inner packaging is Shentong or Tong Yuan, and the outer packaging is China Post, and vice versa.

The phenomenon you mentioned is very common.

For example, if your express is from Shenzhen to Tangshan, why should you transfer to Beijing first?

It is very likely that there are few express orders from Shenzhen to Tangshan on the same day, which is not enough to pack into a box. If air express to Tangshan is not enough, the cost will go up.

So I chose to pack it at Shenzhen cargo terminal and fly it directly to Beijing by air. After arriving at the sorting center in Beijing, the courier company chooses whether to deliver the goods in person or load the courier list to its peers to complete the delivery to Tangshan according to the order received by the Beijing cargo terminal.