What Are the TSA Carry-On Rules?

What are the TSA carry-on rules?

The TSA carry-on rules are the set of guidelines that determine which items passengers may bring through the security checkpoint and into the aircraft cabin. According to the TSA, the great majority of everyday belongings are permitted, but there are important restrictions: liquids must follow the 3-1-1 rule, and certain categories of items, mainly weapons, sharp objects, most tools, flammables, and other hazards, are prohibited in carry-ons even though many can go in checked luggage. The rules apply to both your carry-on bag and your personal item. TSA officers screen every carry-on by X-ray and may inspect bags by hand. Knowing the rules ahead of time lets you pack so nothing is confiscated and you move through the checkpoint smoothly.

What can you bring in a carry-on?

Most personal belongings are allowed in a carry-on. You can bring clothing, books, and toiletries within the liquid limits, along with electronics like laptops, tablets, phones, cameras, and e-readers. Snacks and solid food are fine, as are medications, and valuables such as jewelry, cash, and important documents, which are actually safer in your carry-on than in a checked bag. Small personal grooming tools like nail clippers, tweezers, and disposable razors are permitted, and knitting needles and small scissors with blades under 4 inches are allowed. Liquids, gels, and aerosols are permitted only in containers of 3.4 ounces or less within your single quart-size bag. When in doubt about a specific item, TSA's searchable What Can I Bring list gives the answer.

What is not allowed in a carry-on?

Several categories are prohibited from the cabin. Sharp objects like large knives, box cutters, and scissors with blades of 4 inches or more must be checked, as must most tools over 7 inches. Firearms and ammunition are not allowed in carry-ons and must be declared and transported in checked baggage per strict rules. Flammable items such as lighter fluid, most aerosols beyond toiletries, and fireworks are banned, and self-defense items like pepper spray and stun guns are generally checked-only or prohibited. Liquids over 3.4 ounces are not allowed through the checkpoint. Sporting goods that could be used as bludgeons, like baseball bats and golf clubs, must be checked. Many of these banned items are fine in checked luggage, so the rule is often about where they go, not whether you can bring them.

How does carry-on screening work?

At the checkpoint, you place your carry-on and personal item on the belt to pass through an X-ray scanner while you walk through a body scanner or metal detector. At standard lanes, you must remove your quart-size liquids bag and large electronics like laptops from your bag and place them in separate bins, take off shoes, belts, and jackets, and empty your pockets, so the machines get a clear image. TSA PreCheck members skip much of this, keeping shoes, belts, and light jackets on and leaving laptops and compliant liquids in the bag. If the X-ray flags something, an officer may open your bag for a closer look. Packing neatly and following the rules keeps this process quick.