I think bringing a bag, whether it be a $20 or a $2000 bag, is a bit ridiculous. What could you possibly have in there that you would need that you wouldn't be able to carry. The most you would need at an interview would be a pen and a folder with some pockets for blank paper and for the papers you'll be receiving. What else could you possibly need that would need to be in that bag? Extra socks, underwear, a laptop just in case they ask you if you know how to use the internet? C'mon now. Being superficial isn't going to get you any browny points. I think it would just make it look as if you are trying waaaaaay to hard. 👎