I applied online through my college career website, then was contacted for an interview. There is a mandatory pre-interview dinner, where the representatives give a presentation and meet with the candidates. Have questions ready -- the pre-interview night is just as important as the interview.
The next day was a 20-25 minute interview, which was pretty informal and the questions relatively straight-forward. This is a management position, so I believe a lot of weight is placed on personality.
The second round interviews consisted of a tour of the warehouse, 2 (or 3) 25 minute interviews, depending on if you interviewed one of the candidates at your school. My first interview was extremely informal, where we discussed almost solely more personal topics and my upbringing. My interviewer also opened up about her own life, which was comforting and made the interview fun. The second interview was a lot more typical, and consisted of half an hour of straight questions. We then broke for lunch, which was yet another opportunity to talk to the employees.
After lunch was a two-part test: the first was a multiple choice aptitude test, which is mostly tricky if you second-guess your answers. The second was an essay, which is nothing to worry about.