Air travel security rules on items not allowed in carry on exist to keep passengers, crew, and aircraft safe while minimizing delays at checkpoints. This guide explains what is commonly prohibited in cabin baggage across major regulators, including the European Union Aviation Safety Agency (EASA), the U.S. Transportation Security Administration (TSA), and similar authorities worldwide. Understanding these rules helps you pack faster, avoid costly last-minute purchases, and reduce the risk of having bags inspected or flights disrupted.
Core Prohibited Categories in Cabin Baggage
While specifics can vary by airport and airline, categories of items not allowed in carry on are consistent across most jurisdictions. These include weapons, sharp objects, explosives, certain tools, flammable liquids, and certain sports or self-defense items. In addition, there are strict rules on liquids, aerosols, and gels in carry on, often summarized in limits on volume, container size, and packaging. Screening outcomes and boarding decisions ultimately depend on on-site risk assessments, so rules may be applied differently depending on the operator and context.
Liquids, Gels, and Aerosols Rules
Volume and Container Limits
Liquids, gels, and aerosols in carry on are generally limited to containers no larger than 100 milliliters (about 3.4 ounces), all fitting inside a single clear, resealable plastic bag of about 1 liter capacity. Each passenger typically has one such bag, which must be presented separately for screening. Items not allowed in carry on under these rules include large toiletries, partially full containers, and oversized gel packs. Travel-sized containers that comply with these limits are usually permitted; larger personal care items must be checked or purchased at the airport.
Exceptions and Medications
Medicines, baby food, and infant formula are often allowed in larger quantities but may require declaration and additional screening at security. Expect these items to be inspected visually or swabbed for testing, and allow extra time at checkpoints. Duty-free liquids purchased in secure airside areas can bypass some limits if kept in tamper-evident bags with receipts, but requirements vary by airport and airline, so verify policies before departure.
| Attribute | Verified Detail | Source Type |
|---|---|---|
| Container Size Limit | 100 mL (3.4 oz) or less per item | Regulator guidance (EASA, TSA) |
| Bag Size | Approx. 1 L clear resealable plastic bag | Regulator guidance |
| Number of Bags | Typically one bag per passenger | Common practice |
| Medication Exceptions | Larger quantities permitted with declaration | Regulator guidance |
| Duty-Free Exemption | Allowed when in tamper-evident bag with receipt | Regulator guidance |
Sharp Objects and Weapons
Sharp objects and weapons are among the most consistent items not allowed in carry on. This includes knives with blades longer than permitted, razor blades, utility knives, swords, and martial arts weapons. Kitchen knives, scissors, and tools with sharp edges are usually restricted to checked baggage, though small blunt tools may be allowed in cabin depending on length and design. Always check airline and airport-specific rules, as enforcement can differ for items like multi-tools or specialized equipment.
Tools, Firearms, and Related Items
Hand Tools and Power Equipment
Many tools are considered items not allowed in carry on due to their potential use as weapons. This typically includes drills, saws, wrenches, screwdrivers, and other hand tools, as well as small power tools. Toy or replica tools are often treated similarly to real ones at security. Heavier or more hazardous tools are generally required in checked baggage, and some may need special documentation or handling, particularly when traveling internationally.
Firearms, Ammunition, and Weapons
Firearms, air guns, pellet guns, and most realistic replicas must be checked and usually transported unloaded and secured in a locked compartment. Ammunition is typically prohibited in both carry on and checked baggage unless specific safety and legal conditions are met. Weapon-like items, including stun guns, pepper spray, and certain martial arts equipment, are generally not allowed in cabin baggage and may be restricted or require prior authorization depending on local laws.
Sports, Recreation, and Mobility Equipment
Certain sports and recreation gear can include items not allowed in carry on when they pose safety risks. This often includes items such as hockey sticks, baseball bats, golf clubs (unless as part of a registered sports kit), and archery equipment. Bicycles, skateboards, and scooters usually require checking, and batteries must comply with aviation regulations. Mobility devices such as wheelchairs and scooters are generally permitted but may be subject to inspection; travelers should notify staff in advance and confirm airline handling procedures.
Prohibited Materials and Other Items
- Explosives, fireworks, and flares
- Non-compliant lithium batteries and power banks
- Strong magnets and devices with hazardous components
- Certain chemicals, paint thinners, and flammable substances
- Live animals, except certified service animals
These materials are commonly listed as items not allowed in carry on due to fire, chemical, or safety risks. Regulations on batteries, magnets, and chemicals are particularly strict because of potential hazards in flight. Always check the latest guidance for your specific route, as rules on items such as portable oxygen concentrators, lithium packs, and specialty equipment may require advance approval or special packaging.
Practical Packing Alternatives and Best Practices
To avoid issues with items not allowed in carry on, consider verified alternatives: pack prohibited items in checked baggage, use airport or local purchase options after security, or choose travel-sized versions of liquids and gels within the permitted limits. Keep medications and essential liquids in a dedicated, clearly labeled bag to streamline screening. If in doubt, consult your airline or airport security before heading to the terminal. Smart packing reduces delays, prevents unwanted confiscation, and keeps your journey efficient.