I assume your referring to the Hopper 20? We have not tried bringing ours in but I don't see why not as it is the size of a diaper bag. There is no metal on it and as long as you don't put anything in it that is metal you should be able to get it through the detectors. The Hopper 20, even though smaller, can still get quite heavy once you start putting things in it so I'm assuming you will be putting it in a stroller? I would also try to find a way to tie it off to the stroller so a simple passerby can't snag it easily.