A few years ago I went to the Dome for the Supercross races, and took my K110D, Kit lens, and an old Kiron 80-200. I used my Lowepro Nova 3 AW, which isn't a LARGE bag, but it isn't tiny either. They looked through it, but let me in no problems. I will be using it again this year, instead of my Slingshot 200, JUST in case they won't let it in. Really, all you need is a long zoom, and a wide lens, so room isn't a problem for me. I'll be sitting in the nosebleed seats again this year, as you can see ALL of the action up there, plus it's still only a ten spot !!
A few shots from that day