Any documents for reentering US?

Hello everybody,

I have a canadian citizenship and am working in US with the H1B visa which was effective on Oct.1 this year. I plan to travel outside of US (not Cananda) during the Christmas week. Can anybody let me know what documents I should bring with me in order to reenter US?

The doucments I know are employment qualications letter from my employer, my two months paychecks and the H1B approval notice(I-797 form). Should I do anything else or bring any other document?

Thank you very much for your help.