I first had a phone interview and then was invited to come to the warehouse for a full interview day. The day started off with a tour of the warehouse during which the person leading the tour asked a few questions, e.g. Why do you think we station our best people at this part of the warehouse, How do you think we organize the warehouse. Next was a one-on-one interview with a manager there. He mostly asked questions about my resume and goals. He didn't seem too pleased to have to be interviewing me - showed up 10 minutes late, ended the interview 20 minutes early, and definitely had an attitude and generally gave off the impression that he didn't think I was worthy of the job right from the get-go. Next I was taken for an "informal lunch" in the cafeteria by two younger managers who were nice and seemed genuine - probably got the best information about what it was like to work there out of them. The day then ended with another interview by a manager there. It was incredibly strained, and he didn't really seem to have any questions for me at all. He asked me what I didn't like about their catalogue and how I saw myself changing McMaster-Carr - strange questions that I didn't really know how to answer given that I had been there all of 3 hours. Beyond that we just talked about my undergraduate senior thesis.