Yes, you can bring a stun gun in checked baggage if it’s inoperable and any spare lithium batteries ride in your carry-on under TSA and FAA rules.

Yes — spray deodorant is allowed on planes: up to 3.4 oz/100 mL in your carry-on (inside the 3-1-1 bag) and up to 500 mL per can in checked baggage.

Yes, you can bring sourdough starter on a plane: in carry-on it must follow the TSA 3-1-1 liquids rule, and larger jars belong in checked bags.

Yes, a snackle box is allowed in carry-on if it holds solid foods; dips, spreads, and liquids must meet TSA’s 3-1-1 rule or go in checked bags.

Yes—TSA allows small snowglobes in carry-ons if they’re 3.4 oz/100 ml or less and in your quart-size bag; larger ones must go in checked bags.

Yes—bringing a smoke detector on a plane is allowed; pack it in carry-on or checked bags while following battery rules and keeping it switched off.

Yes, you can bring a small toothpaste on a plane — as long as the tube is 3.4 oz/100 ml or less and fits in one quart-size liquids bag; bigger tubes ride in

Yes, a small umbrella in carry-on is allowed; place it in the tray if asked and avoid sharp or hidden tips.

No, knives belong in checked bags in the U.S.; a small knife in carry-on is barred, except a round-bladed butter knife or plastic cutlery.

Yes, you can bring a ski helmet on a plane in carry-on or checked baggage; TSA permits helmets, and airline size and storage rules still apply.