Workers lugging suitcases and bags return to work at a factory in the Pearl River Delta industrial hub of Dongguan, China February 25, 2016. Millions of migrant workers streaming back to China's industrial heartland after the long lunar New Year break are facing an uncertain future, as smaller factories in particular struggle to cope with anemic orders and rising inventories. Picture taken February 25, 2016. REUTERS/James Pomfret