Why the website weight and me are not the same?

DHL UPS and other international express service providers and agents, the label does not show the actual weight or volume weight display. (commonly known as the escape, escape the heavy industry is ubiquitous phenomena and facts, Baidu search.)
(I can't control the DHL service provider to print in the face of single weight. Many service providers in order to make a profit, according to weight, less weight to print, or not to print volume weight. Our company can do is before shipment and the guests to confirm the actual weight and volume weight, and take this as the standard, on time delivery.)
MYEX min Asia International Express
2013-03-28