We’ve all been there. You’re standing in a security line that’s moving at the pace of cold molasses, watching someone ahead get pulled aside while a TSA officer digs through their bag with the look of someone who has found exactly what they expected to find. The delay ripples backward – and suddenly your tight connection feels very, very tight. Honestly, most of these holdups are completely avoidable.
The good news is that getting through security faster isn’t some insider secret. It mostly comes down to knowing what not to pack. TSA screens approximately 3.3 million carry-on bags for explosives and other dangerous items daily, and a surprising number of those bags trigger extra scrutiny over items that could have simply been left at home or tossed into a checked bag. Here are the 11 items most likely to slow you down – or stop you cold. Let’s dive in.
1. Oversized Liquids and Toiletries
This is the one that trips up even experienced travelers. It seems simple enough, but the bathroom cabinet raid the night before a flight has a way of sneaking full-size shampoo bottles into your bag. You are allowed to bring a quart-sized bag of liquids, aerosols, gels, creams and pastes in your carry-on bag, and these are limited to travel-sized containers that are 3.4 ounces (100 milliliters) or less per item.
Any liquid, aerosol, gel, cream or paste that alarms during screening will require additional screening, which translates directly into lost time at the checkpoint. Think of it this way: that full-size bottle of conditioner is not worth missing your flight. Pack it in your checked bag, or buy it when you arrive.
2. Sharp Objects and Knives
This one seems obvious, but you’d be surprised how many pocket knives get flagged because someone genuinely forgot they were in their bag. Sharp and pointed items, including all knives except blunt butter knives and sharp tools like box cutters and ice picks, are banned from carry-on and can only go in checked luggage, properly sheathed or wrapped.
Knives of any length, except plastic cutlery and round-bladed butter knives, are prohibited, as are razor-type blades such as box cutters, utility knives, and non-disposable razors, though disposable safety razors and disposable safety razor blade cartridges are excluded from this prohibition. If you’re a camper or outdoor type, do a thorough pocket check before you even leave for the airport.
3. Firearms and Ammunition
Let’s be real – most travelers know you can’t bring a gun in your carry-on. Yet carrying prohibited items may cause delays for you and other travelers, but they may also lead to fines and sometimes even arrest. The penalties are not small, either. TSA may impose civil penalties of up to $17,062 per violation per person.
Unloaded firearms can be transported in a locked hard-sided container as checked baggage only, and you must declare any firearms and ammunition to your airline when checking in your luggage. It’s also worth knowing that TSA now considers frames, receivers, and 3D printed guns to be firearms under its civil enforcement program, so there’s no gray area to exploit here.
4. Large Electronics Left Buried in Your Bag
Here’s the thing: your laptop isn’t banned from a carry-on, but how you pack it absolutely affects how fast you get through. You will be asked to remove personal electronic devices larger than a cell phone from your carry-on bag and place them into a bin with nothing placed on or under them for X-ray screening. If you’ve buried your laptop under three sweaters, a rain jacket, and a bag of snacks, you’re going to hold up the entire line while you excavate it.
Common examples of devices that must be removed include laptops, tablets, e-readers and handheld game consoles, but this does not include items such as hair dryers, electric shavers or electric toothbrushes. The simple fix? Pack your laptop on top, in an easy-access layer. Your fellow travelers will quietly thank you.
5. Large Amounts of Powder
Powders are one of the sneakier slowdown items because most people don’t think twice about them. Protein powder, dry shampoo, baby powder, face powder – they can all trigger a secondary screening. TSA officers may instruct travelers to separate items from carry-on bags such as foods, powders, and materials that can clutter bags, and powders over 12 oz. or 350 mL in carry-on baggage may require secondary screening.
The practical advice here is straightforward. TSA encourages you to place powder-like substances over 12 oz. or 350 mL in your checked bags, because powders in carry-on baggage may require secondary screening, and powders that cannot be resolved by security officials will be prohibited from the cabin. If you’re bringing a big tub of supplements, put it in your checked luggage without a second thought.
6. Wrapped Gifts
This is a holiday travel trap that catches people every single year. You’ve spent time carefully wrapping a beautiful gift, and then a TSA officer has to tear it open at the checkpoint. It’s genuinely painful to watch. TSA recommends carrying unwrapped gifts if they may trigger alarms, because wrapped boxes might be opened for inspection.
The solution is simple but admittedly a little less festive: carry gifts unwrapped or use a gift bag instead of taped paper. You can always wrap them after you arrive at your destination. Think of it as building in some extra quality time with the recipient – you’re wrapping the gift together. That’s practically a tradition waiting to happen.
7. Pepper Spray and Self-Defense Items
Lots of people carry pepper spray or mace as part of their everyday routine. The problem is that what works in your daily life doesn’t work at 30,000 feet. Pepper spray and mace are not allowed in carry-ons, and you may only pack one container of 4 fluid ounces or less in checked baggage if it has a safety cap.
Other self-defense items like tasers, stun guns, and brass knuckles are generally banned from carry-on and often from checked luggage as well. Getting flagged for one of these items doesn’t just delay you – it can result in a very unpleasant conversation with law enforcement before your trip has even properly begun. Leave them at home or ship them ahead.
8. Overstuffed, Cluttered Bags
It’s not always a specific item that holds you up – sometimes it’s the sheer chaos of a poorly packed bag. TSA recommends keeping your bag organized to help ease the screening process, as it takes time for TSA officers to make sure a jam-packed, cluttered, overstuffed bag is safe. Think of the X-ray machine like a window. If the view is blocked, someone has to look harder – and that means you wait.
Packing items in layers, such as shoes in one layer, clothes in another, and electronics in another, helps keep things orderly and scannable. It’s a small habit that pays off every single time you travel. A well-organized bag is essentially a fast-lane pass through the X-ray conveyor.
9. Fireworks and Explosive Materials
It sounds like a no-brainer, but confiscations of fireworks happen at airports with shocking regularity, especially around summer holidays. All fireworks contain explosive materials and are not permitted in checked or carry-on baggage. This is a blanket ban – there are no exceptions for small sparklers or novelty items.
No fireworks or large fuel canisters may fly, and even novelty sparklers or small fireworks are confiscated. The consequences go well beyond a slow security line. Attempting to bring fireworks through a checkpoint is the kind of thing that can end your trip before it starts, and potentially result in legal trouble. It simply isn’t worth the risk.
10. Powerless or Dead Electronic Devices
This is one that catches people off guard. You’d think a dead phone or dead laptop is less of a concern at security, not more. The opposite is actually true. TSA officers may ask you to power up your electronic device, including cell phones, and powerless devices will not be permitted onboard the aircraft. A device that can’t be turned on looks suspicious, period.
Even if an item is generally permitted, it may be subject to additional screening or not allowed through the checkpoint if it triggers an alarm during the screening process, appears to have been tampered with, or poses other security concerns. Always charge your devices before you head to the airport. Carrying a small power bank in your personal item for a quick top-up before the checkpoint is a genuinely smart habit.
11. Hazardous Materials and Flammable Substances
This category is broader than most people realize, and it includes everyday items you might not think of as hazardous. Lighter fluid, certain aerosols, flammable paints, and similar substances can all create serious delays or outright confiscation. Most hazardous materials are forbidden in carry-on and checked baggage, with only a few exceptions for personal items such as toiletries, medicines, battery-powered electronics, and assistive devices.
Certain items like flammable substances and bear spray are prohibited in both carry-on and checked luggage, which means there’s no workaround. If you’re unsure whether something qualifies, the TSA’s own “What Can I Bring?” tool on their website will give you a clear answer in seconds. It’s hard to say for sure that every traveler knows this resource exists, but it is genuinely one of the most underused tools in travel planning.
The bottom line is that a fast, smooth security experience is mostly in your own hands. None of these items are mysterious. Most of the time, a quick mental inventory before you zip up your bag is all it takes. Planning ahead and packing properly can facilitate the screening process and ease your travel experience at the airport. So next time you’re packing the night before, just take an extra two minutes to ask yourself: does any of this belong in my carry-on? Your future self, breezing past the secondary screening table, will be grateful.
What do you think – have you ever been held up at security over something you didn’t expect? Tell us in the comments.