A man rides a motorcycle as he delivers a box in Shanghai July 11, 2012. China's 35,000 express delivery companies can ship packages hundreds of miles for less than the cost of a standard U.S. letter, pricing out global players such as FedEx and UPS who control just 3 percent of the fast-growing market. Backed by an e-commerce boom, China's express delivery market more than doubled to $13 billion in revenue in the five years to 2011, and is expected to overtake the $70 billion U.S. market to become the world's biggest within two decades. But with so many local companies vying for business, a crushing price war that has already driven Deutsche Post's DHL out of the domestic market may trigger a massive wave of consolidation that eliminates thousands of small firms. Picture taken on July 11, 2012. To match story CHINA-DELIVERY. REUTERS/Aly Song (CHINA - Tags: BUSINESS TRANSPORT)