According to current guidelines, you can generally bring a small sewing kit on a plane in your carry-on baggage.
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If packed in carry-on, they must be less than 4 inches from the pivot point. Any sharp objects in checked bags should be sheathed or securely wrapped to prevent injury to baggage handlers and inspectors. For more prohibited items, please go to the 'What Can I Bring?'
Tools 7 inches or shorter (measured from end to end when assembled) may be allowed in carry-on baggage. Power tools and all tools longer than 7 inches (measured from end to end when assembled) are prohibited in carry-on baggage; these items must be packed in your checked bags.
Safety Razors: Because the razor blades are so easy to remove, safety razors are not permitted in your carry-on luggage with the blade. They're fine to pack in your carry-on without the blade. The blades must be stored in your checked luggage. The same applies for straight razors.
TSA allows bringing nail clippers on planes. You're allowed to pack them in hand and checked baggage without any packing restrictions. They're considered harmless because the blade on them is too short to successfully be used as a weapon.
Firearms and ammunition, as well as any replicas or imitations. Explosives and flammable items, such as fireworks, gas, and aerosols. Poisonous and toxic substances, including pesticides and certain chemicals. Lithium batteries and other hazardous materials, as these can pose a safety risk if not handled properly.
Each passenger is limited to one quart-size bag of liquids, gels and aerosols. Common travel items that must comply with the 3-1-1 liquids rule include toothpaste, shampoo, conditioner, mouthwash and lotion.
Is Mascara Considered a Liquid by TSA? TSA counts mascara as a liquid, so the 3-1-1 rule for packing it in hand luggage applies. It states that all liquids have to be in 3.4 oz (100 ml) bottles or smaller and packed in a 1-quart bag. Mascara usually isn't above 3.4 oz, so you're free to pack it in your hand luggage.
If TSA officers find marijuana or other drugs during a routine screening process, they're supposed to notify local law enforcement, which makes the final call. That final call can vary. If you're in a state where marijuana is legal, local law enforcement probably won't respond to airport calls if it's found.