China's courier sector saw an almost 40-percent increase in its business volume during the past five-day May Day holiday, the State Post Bureau said on May 6.

Some 1.1 billion parcels were collected during the period, up 41.8 percent year on year, while 1.04 billion parcels were delivered, up 38.93 percent from a year earlier, the bureau said.

The booming online sales of food, daily necessities and electronic devices has stimulated small- and medium-sized enterprises to fast-track work resumption, the bureau said.

Online sales of agricultural products also maintained fast growth thanks to sufficient supply and demand, the bureau added.