Here are rules of thumb from a family member who travels often -- and travels lightly -- by air:
(1) If you're not sure whether something is alright to bring or not, don't bring it.
(2) If you can't afford to have something confiscated, don't bring it.
(3) If you have any question at all about an item, don't bring it.
She developed these rules after a male TSA officer confiscated her eyelash curler because he didn't know what it was. Yes, that's right. She had to ask a female office to please come over and explain the facts of life to this obviously single and quite dateless male officer. Now she travels with the bare minimum and buys what she needs at her destination. She also throws it out before returning. Why not bring it back? Not worth the hassle, she says.