early in the morning from hangzhou to Shanghai Pudong

Well, do you mean that you need to arrive at Shanghai Pudong airport at 08:30 or is it your flight at 08:30?
If your flight is at 08:30, you'd better reach Shanghai City around 5:30am~6am from Hangzhou and then take a taxi to the airport directly. Time is really limited. Pulic transport usually starts operating around 0530 or 0600. I'm afraid you don't have enough time to spend riding them.
If you are expected to reach the airport around 0830, then you can experience the Maglev. You can take the night train from Hangzhou to Shanghai South. Then take subway line 1 from Shanghai South train station to people's Square and transfer to subway line 2 to Longyang Road. Then take the Maglev train to the airport. Well, this may be inconvenient for you since you have a lot of stuff. You may also take a taxi directly to Longyang Road Maglev Station and then take the Maglev to the airport after arrival at Shanghai South train station.