Physically Carrying Cash (USD)

Hello!
I have been saving my RMB salary for months, and am now trying to move it back to the US.
Can I physically carry less than 5,000USD on my person when leaving China, without declaring it? I can just keep it in my moneybelt, and pass through customs no problem?

My family member will visit me on a legal visa. Can I give her USD cash to carry as well out of China?

Please let me know your thoughts!