Initial interview was a personal tour of the facility during the AM sort (normally, it's a group tour, but someone messed up the calendar when it came to mine, and gave me the wrong info). Sat down afterwards with the hiring manager and the following day with the AM sort supervisor. To a certain degree, they're mainly looking for bodies. However, that said, they're also looking for dependability and people who aren't afraid to get their hands dirty. Show them that you're dependable and that you're not scared to sweat a little, and you'll probably be fine. Be courteous and be nice.