Usually put it on your knees, or on the floor on the left side of the seat (in short, don't put it on the recruiter's desk).

Men must not go home empty-handed in an interview. Even if you bring an empty briefcase, you will be taller than an empty candidate.

If you are a lady, you can choose to bring a big leather bag and put a folder in it, so that your documents will not be wrinkled.