Flaming Lips July 8th/What can you bring into the Aragon Ballroom?

YO. I'm going to see the flaming lips at the aragon ballroom in chicago in a couple of weeks and i'm wondering what the rules of this venue are like.. the place looks pretty dope, but ya never know. will they let me bring something like a book bag in? it's be nice to have something to put all of my "stuff" in. their website sucks, it doesn't really tell you anything. any one that has been there - your help would be killerrrr