Public transport from Shekou Walmart to the Shenzhen airport?

Hi, I will take fly from Shekou Walmart to the Baoan Airport. As last time it took me 140RMB, too expensive. SO this time I am going to look for a public transport. Thus I wonder can I take any bus to the airport. I will carry one big luggage and one small hand luggage. Thus If i go by bus, is there space for them? Many thanks. AN