No need to bring a resume - that's your AADSAS application.
I wouldn't worry much about bringing a laptop, your credit cards in your wallet are probably worth more than your laptop.
I put my suit in my roller suitcase last time I flew, but this time I'm just using a garment bag and folding it up into 1/4s if I get hassled.
Pen is a good idea, though I've been given that at every interview. Every time I get one, I think - this might be one very expensive pen and nothing else... LECOM hooked it up with a 2 gig flash drive, too!
I've seen other applicants with the leather zip-up folders, which I liked. If the school doesn't give you a folder, slipping the papers into a sleek zip-up looks better than into your suit. Plus it gives you something to hold on to if you're nervous and can't figure out where to put your hands.