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Yes — a JBL speaker is allowed in carry-on; switch it off, pack it snugly, and keep any spare lithium batteries in the cabin, not in checked bags.

Yes—empty hot water bottles are fine in carry-on and checked bags; filled bottles can’t pass security due to liquid limits.

Yes — TSA allows hair dryers in carry-on and checked bags; cordless models with lithium packs belong in carry-on with any spares protected.

Yes, plug-in electric heaters can go in carry-on or checked; propane or fuel-burning heaters are banned, and battery heat devices face extra limits.

Yes—TSA allows a homemade sandwich in carry-on bags as a solid food, but wet fillings and sauces must follow the 3-1-1 liquids rule.

Yes, a hammer can go in checked luggage; keep it out of carry-on and wrap or sheath the head to prevent damage or injury.

No, a hammer through TSA can’t go in carry-on; pack it in checked baggage. Hand tools 7 inches or less may ride in carry-on.

Yes, you can bring a heated vest on a plane; pack the lithium battery in your carry-on and keep the heat switched off during screening.

Yes—checked baggage only; a hurley (hurling stick) is treated like a bat or club, so keep it out of your carry-on and pack it securely for the hold.

Yes. On most routes you may place a knife in checked baggage for international travel, but pack it sheathed and make sure the destination does not ban that