porjectdp's picture reminded me - a small package of Kleenex comes in very handy. Wet Ones or some sort of wipe do too. I'll second the recommendation on snacks and water. I used to carry a small thermos of hot tea during the cold winters at Michigan State. A bit heavy and bulky, but very welcome, and cheaper than buying coffee. As far as backpacks go, look for something inconspicuous. Anything too tactical or expensive will draw attention to itself, and it might grow legs and disappear when you're not looking. I'd go with something simple, like a Jansport daypack. Some people prefer messenger bags, but I found it easier to carry something with 2 straps, especially when loaded with books and papers. Kevin B.