TSA has to be the most vape-aware group around. This last time I flew, I my bag got flagged for a hand re-check. The girl rummaged past my kayfun in one of the pockets, so I offered that "hey, just where you were just looking, that's something with a small amount of liquid, and since I'm not flying overnight I didin't have my liquids bag to put it in." She says, no sir, it's not your kayfun with a drop tank, and by the way these bins are gross, I wouldn't put your vaporshark and dripper in there without a paper towell or something." I forget what she found that triggered the second check, but it wasn't vape related. Hardware in your carry-on, or better outside in the bin itself, is the way to go. Liquids in your liquid / toiletry bag if you got more than a few mil.