​The function of the packaging boxes

What are the function of the packaging boxes ?? why we should make the suitable packing boxes for our production ?? the main reasons are as per the below :

1. Realizing the value of products and the value of use, and is a means of increasing the value of products;
2, protect products from the sun, rain, dust pollution and other natural factors, to prevent losses such as volatilization, leakage, melting, pollution, collision, crushing, loss and theft;
3. Facilitate the storage, transportation, adjustment and sales of circulation links, such as loading and unloading, inventory, palletizing, delivery, receiving, transshipment, sales counting, etc. 

4. Beautifying goods and attracting customers is conducive to promotion.