The TSA 3-1-1 rule for liquids allows passengers to bring liquids, gels, and aerosols in containers of 3.4 ounces (100ml) or less per item. These containers must fit in a single, transparent, resealable 1-quart-sized bag. Each passenger is limited to one such bag.

The name "3-1-1" comes from:

• 3.4 ounces (100ml) maximum container size
• 1 quart-sized bag per person
• 1 bag per passenger

This rule applies to items like shampoo, conditioner, lotion, toothpaste, and other liquid or gel-like substances.

Learn more about bringing liquids on planes

Yes, exceptions to the 3-1-1 rule include:

• Medications: Liquid medications are allowed in reasonable quantities exceeding 3.4 ounces.
• Baby formula, breast milk, and juice: For infants or toddlers, these are allowed in reasonable quantities.
• Liquid nutrition: For passengers with medical conditions.

These excepted items don't need to be in the quart-sized bag, but you should declare them at the security checkpoint for additional screening.

Duty-free liquids purchased internationally and sealed in a secure, tamper-evident bag may also be permitted if they were purchased within the last 48 hours and have the receipt attached.

For standard TSA screening:

• Laptops must be removed from bags and placed in a separate bin.
• Tablets and e-readers typically need to be removed as well.
• Smaller electronic devices like phones, headphones, and chargers can usually remain in your carry-on bag.

If you're enrolled in TSA PreCheck and using a designated lane, you typically don't need to remove laptops or other electronics from your bag.

Rules can vary by airport and country, so it's best to follow the instructions of security officers at your specific location.

Learn more about bringing electronics on planes

Most batteries (lithium-ion, alkaline, NiMH) are allowed in carry-on luggage, but there are restrictions on spare lithium batteries, which must be protected against short-circuiting. Loose batteries should be in original packaging or have terminals taped. Large lithium batteries (over 100Wh) may require airline approval.

Learn more about bringing batteries on planes

Most food items are allowed in carry-on and checked bags. Solid foods like sandwiches, fruits, and snacks pose no issues. Liquid or gel-like foods (spreads, dips, etc.) must follow the 3-1-1 liquids rule in carry-on luggage. International travelers should check agricultural restrictions for their destination country regarding fresh produce, meats, and dairy.

Learn more about bringing food on planes

Yes, prescription medications are permitted in carry-on and checked baggage. It's recommended to keep them in your carry-on in original labeled containers. Liquid medications are exempt from the 3-1-1 liquids rule but should be declared at security. For international travel, carry a copy of your prescription or a doctor's note, especially for controlled substances.

Learn more about bringing medication on planes

Safety razors with removable blades are prohibited in carry-on luggage but allowed in checked bags. Disposable razors and electric razors are permitted in both carry-on and checked luggage. Straight razors are only allowed in checked baggage.

Learn more about bringing razors on planes

Items absolutely prohibited in both carry-on and checked luggage include:

• Flammable items: Gasoline, lighter fluid, torch lighters, matches (more than one small pack)
• Explosives: Fireworks, flares, replicas of explosives
• Disabling chemicals: Mace, pepper spray, tear gas
• Sharp objects: Large knives (in carry-on), razor blades (in carry-on)

Some items are allowed in checked baggage but prohibited in carry-on:

• Firearms and ammunition: Must be properly declared, unloaded, and in a locked, hard-sided container
• Certain sporting goods: Baseball bats, golf clubs, ski poles, etc.
• Tools over 7 inches: Hammers, drills, wrenches, pliers

Regulations may vary by country and airline, so always check specific rules before traveling.

For domestic flights within the United States:

• Adults (18+) need a valid government-issued photo ID such as a driver's license, state ID card, or passport.
• Starting May 7, 2025, you'll need a REAL ID-compliant license or another acceptable form of ID for domestic air travel.
• Children under 18 traveling with an adult don't need ID for domestic flights, but airlines may require a birth certificate.

For international flights:

• A valid passport is required for all passengers, including infants and children.
• Some destinations may require your passport to be valid for at least 6 months beyond your departure date.
• Depending on your destination, you may also need a visa or other travel documents.

Always check with your airline for their specific requirements before traveling.