Zou Huawei, a deliveryman at the Wuhan office of Yunda Express Co, said he has not been able to work for days because of the heavy rain.

"It's impossible for me to get out of the apartment, let alone to deliver goods to other people. The rainfall would definitely get all the packages wet," he said.

Despite the difficulties in making deliveries due to rain, flooding and traffic problems, residents of Hubei province, one of the areas hit hardest by flooding, ordered more daily necessities than usual online, while delivery companies tried their best to keep the packages moving.