I almost always have a camera with me, whether it's a Holga, a P&S, or my DSLR. The Holga is cheap and plastic, so I don't mind it bouncing around whatever bag I'm carrying. If I have the DSLR (a.k.a. Cthulhu) with me, I use my Tamrac backpack. As many of the old-timers here may remember, I had my camera with me on 9.11 (I worked downtown at the time) and the big black out a few years later, and got shots of both. Always, always, always carry a camera with you!