Put it with your pens, no one will notice. I carry a portable inkwell with me every week (about half an ounce of not dangerous, but potentially messy, liquid) and have yet to take it through in a freedom baggie. Lined up next to my fountain pens, it looks like another pen. (They should make me check it; if I were to open it on a plane, I could cause extensive dry-cleaning bills within a six-foot radius. )