What Not to Pack: Banned and Restricted Items in Carry-On and Checked Bags

Short answer: Power banks, spare lithium batteries and vapes must go in your carry-on, never your checked bag. Knives, most tools, gel candles and liquids over 3.4 oz (100 ml) go in your checked bag. Powders, solid candles, solid chocolate, knitting needles, canes, laptops and phones are allowed in both. Strike-anywhere matches are banned everywhere. US rules are from the TSA What Can I Bring? tool; other countries and individual airlines can be stricter.

Every year, transportation security agencies around the globe confiscate millions of pounds of prohibited items from passenger luggage. The vast majority of these items do not belong to criminals or smugglers; they belong to everyday travelers who simply assumed that if an item is legal to own, it is legal to pack.

Aviation security regulations operate under two distinct safety philosophies:

1. Cabin Security (Carry-On Bags): Preventing items that could be used as a weapon, incendiary device, or physical threat against crew and passengers.
2. Cargo Safety (Checked Luggage): Preventing materials capable of causing uncontrolled fires, explosions, structural corrosion, or toxic gas leaks inside the unpressurized or inaccessible cargo hold.

Because the rules for your carry-on bag are nearly the exact inverse of the rules for your checked suitcase, knowing where an item belongs is the difference between a seamless boarding process and watching a $90 Swiss Army knife or a $60 battery bank tossed into an airport incinerator bin.

Here is the complete master breakdown of what not to pack, what items are banned, and where every restricted item belongs.

1. Quick Reference: Where Common Items Belong

US rules, checked against TSA item pages on 25 September 2026. The TSA officer has the final say, and airlines or other countries can be stricter.

2. The Lithium Battery Danger: The Number One Cargo Ban

If you take only one rule away from this guide, make it this: Never pack spare lithium-ion batteries, external battery power banks, or vape devices inside a checked suitcase.

Lithium-ion batteries contain high energy density electrolytes. If a battery experiences physical impact during baggage handling, an internal short circuit, or manufacturing defect, it can enter a state known as thermal runaway. In thermal runaway, the battery generates extreme heat (over 1,000°F / 540°C), venting flammable gases and igniting neighboring luggage.

Why the Cabin is Safe but the Cargo Hold is Not

In the passenger cabin, a smoking or burning laptop or phone can be detected immediately by flight attendants and placed inside a dedicated fire-containment bag or submerged in water. In the cargo hold beneath the floorboards, a fire can breach the hull before automated halon fire suppression systems can fully extinguish a burning lithium battery chemical reaction.

The 2026 Power Bank Standards

• Under 100 Watt-hours (Wh): Permitted in cabin with no airline notification needed (most consumer phone power banks are 37Wh to 74Wh).
• 101Wh to 160Wh: Up to two larger capacity units allowed in cabin with prior airline approval (typical for heavy-duty drone batteries and pro camera rigs).
• Over 160Wh: Completely banned from commercial passenger aircraft.

[!WARNING] Gate-Check Trap: If gate agents ask you to volunteer to gate-check your carry-on roller bag at the jet bridge, you must remove all power banks, laptops, e-cigarettes, and lithium accessories before handing the suitcase to baggage handlers. Leaving a power bank inside a gate-checked bag is a federal aviation violation.

3. Sharp Objects & Everyday Tools: Cabin Prohibitions

Anything featuring a sharp edge capable of cutting or puncturing is banned from cabin baggage:

Knives, Blades, and Multitools

• Pocket Knives: Swiss Army knives, Leatherman tools, box cutters, and hunting knives of any size are 100% prohibited in carry-on bags. Even tiny keychain utility blades will be confiscated.
• Multitools: You can only carry a multitool in your cabin bag if it is blade-less (featuring only pliers, wire cutters, and screwdrivers under 7 inches). Even then, uninformed screening officers frequently confiscate them. When in doubt, place multitools in checked bags.
• Scissors: Metal scissors with blades longer than 4 inches (10 cm) from the pivot point are banned in carry-ons. Safety shears and small grooming scissors under 4 inches are permitted.

Shaving Razors: The Subtle Difference

• Disposable Cartridge Razors (Gillette, Venus, disposable plastic razors): Allowed in carry-on. The razor blade is permanently embedded in a plastic cartridge and cannot easily be extracted as a weapon.
• Safety Razors & Straight Razors: The handle is allowed, but loose replacement razor blades are strictly prohibited in cabin luggage. If you travel with a vintage double-edge safety razor, leave the razor blades in your checked bag or buy blades at your destination.

4. Liquids, Creams, and the "Food as Liquid" Trap

Most travelers understand that shampoo bottles exceeding 100ml (3.4 oz) cannot pass airport security checkpoints. But where thousands get tripped up every week is food items.

Under TSA and international security standards, liquids are defined by consistency, not nutritional category. If an item is spreadable, pourable, viscous, or paste-like at room temperature, it is legally a liquid.

Foods That Count as Liquids (Banned over 3.4 oz in Cabin)

• Peanut butter, Nutella, and almond butter
• Soft, creamy cheeses (Brie, Camembert, ricotta, goat cheese)
• Hummus, guacamole, and salsa dips
• Yogurt, puddings, and custards
• Jams, jellies, honey, and maple syrup
• Canned soups and sauces
• Snow globes (the water volume inside almost always exceeds 3.4 oz)

Foods That Are 100% Solid (Allowed in Carry-On)

• Hard cheeses (Cheddar, Parmesan, Manchego)
• Fresh sandwiches, wraps, and burritos
• Solid bakery goods, cookies, and bread
• Raw or dried fruit and nuts
• Chocolate bars and candy
• Protein bars and dry snacks

5. Dangerous Goods Banned from the ENTIRE Plane

Certain hazardous materials are so volatile that they are prohibited from both cabin luggage and checked baggage. Do not bring these to the airport under any circumstances:

1. Flammable Liquids & Fuels

• Lighter fluid, butane refills, and camp stove fuel
• Aerosol spray paints, solvent cleaners, and turpentine
• Gasoline, kerosene, and motorized equipment containing residual fuel

2. Strike-Anywhere Matches

• Standard safety matches (that strike on the box) are permitted (one book carried on your person). Strike-anywhere matches are completely banned anywhere on the aircraft because friction between moving bags can cause spontaneous ignition.

3. Flare Guns, Fireworks, and Explosives

• Party poppers, sparklers, fireworks, flares, and gunpowder are completely forbidden under strict federal criminal penalties.

4. Smart Luggage with Built-In Non-Removable Batteries

• Modern suitcases featuring built-in USB power ports, motorized wheels, or digital weight scales are popular. However, if the lithium battery unit cannot be unclipped and removed, the suitcase is barred from commercial flight by all major airlines.

6. How PackPilot Eliminates Packing Errors

Trying to cross-reference multiple bags, airline dimensional constraints, and aviation regulatory rules by memory is an invitation to airport confiscation.

PackPilot helps with the list itself:

• A categorised checklist: Built from your trip, so electronics, toiletries and tools are in one place to review against the table above.
• Notes on items: Add "carry-on only" to the power bank or "checked bag" to the pocketknife so the decision is written down.
• Ask Zippy: The built-in assistant can talk through what to pack. For anything regulatory, such as medication or battery limits, treat its answer as a starting point and confirm with the official TSA, FAA, or airline page.

PackPilot does not check items against security rules or split them between bags. The table above and your airline's own policy are the authority.

7. Pre-Airport Departure Checklist

Before zipping your suitcases and ordering your taxi, run this 60-second inspection:

1. Check all pockets for pocketknives: Reach into your everyday backpack, jacket, and toiletry kit. Multi-tools and pocketknives forgotten in bottom pockets account for over 40% of checkpoint surrenders.
2. Transfer all power banks to your personal item: Verify that zero external batteries or loose lithium packs remain in checked bags.
3. Decant oversized liquids: Ensure every lotion, cologne, and toothpaste tube in your cabin bag is stamped 3.4 oz / 100 ml or less.
4. Separate medications and baby milk: Keep prescription medication bottles and infant milk together so you can quickly present them to screening officers for separate inspection.

Related Travel Guides

• New Power Bank Rules for Flights: What Changed in 2026
• TSA Liquid Rules: The 3-1-1 Bag, What Counts as a Liquid, and Why Europe Is Different
• Personal Item vs Carry-On: Size Differences, Rules, and What Counts
• Flying With Medication: TSA Rules, Liquid Exemptions, and International Laws
• Expert Travel Packing Guides & Checklists
• PackPilot AI Travel Checklist App