In January '13 I did a backpacking trip through Turkey / China / Singapore / Indonesia / Malaysia / Cambodia / Thailand / China (again) / Turkey (again).
To realize it, I needed a Chinese multiple-entry visa. Yes, it's possible for a backpacker traveler to get that visa.
To get it I needed to fill an extensive application form from the Chinese consulate. Already in the application form they ask to you whether you need a single entry visa or multiple entry visa. Moreover, the main things they required from me was:
- Book a hostel/hotel or inform any place where I'll stay (They require the place's address in the form application)
- Tell them how many days you will stay on China
- Explain what you will do in China (There was no problem in saying I was going to China to on backpacking trip. But to reinforce it I wrote on the form all the routes was going to travel.)
They gave me a two-entry visa.They gave me a two-entry visa. It was so simple, with no interview, without entering the consulate. I just sent the documents via mail and waited for them to return my passport with my visa.
I got the visa in my country (Brazil). The process is lazy and it took 2 weeks to be finished.
I hope this can help you. If you need some extra information, please add in comments.