The backpacks nowadays have changed a lot from those used for many years. The previous backpacks can only be used to carry things. With the diversification of people’s needs, backpack manufacturers have also innovated in the functions of backpacks, just like many backpacks nowadays. The principle of the USB interface charging function is that there is a cable inside the backpack connected to the power bank, and then an external charging interface, when the mobile phone is out of power, it can be connected to the external charging interface for charging.
Today we are not talking about this usb function. What we are going to talk about today is a function of the backpack trolley. Generally, we will choose a trolley case and a backpack when we travel on business or far away. If there are more things in the backpack and heavier, Then you can put the backpack on the tie rod, so many customers will require a tie rod function when customizing the backpack. Now there are two ways to do this function. Let’s briefly talk about the two basic methods of this function.
The first method is relatively simple. It is to sew a webbing directly on the back of the backpack and reinforce the two ends with dates. This method is low cost and suitable for limited budgets. Its disadvantage is that it is not very beautiful. Due to the particularity of the webbing, It is also easier to crack.
The second method is to use the air cushion function of the back panel to hide the function of a pull rod. We all know that better backpacks have air cushions on the back panel. The purpose is to make the backpack more comfortable and breathable. You have to wear a stinky sweat. The manufacturer only needs to not connect the air cushion to the back panel of the backpack when making the air cushion. The appearance does not look unusual. In fact, the inside can be covered with a tie rod. This method is both beautiful and durable.