Both Jura's and Mike's answers are good.
I might add that "stuff" is informal. If you were talking to a somebody you just met in a professional situation, you would use "things" or refer to the object(s) directly.
"Hello Mr. Smith. Where would you like your things put?"
The people at a hotel would tell you "We will bring your luggage to the room."
If you are with friends, "stuff" is perfectly acceptable.