Hmm... Now I'm curious too.
We are going to DC and also plan to do SW, Aq, and BG.
I believe the papers I printed say something like, "just take to the turnstiles". (Although, I'm not at home now-- I will double check them tonight)
Are we going to get some sort of tickets? I would rather carry around small tickets/cards for the two week trip than a wad of folded papers. I really don't want to carry a bag around just to hold the papers and it would be a constant worry for me that they would get wet and smear the barcodes or something.