What can you bring it on on a plane.
Airport security confiscates millions of items every year, most of them from travelers who assumed something was fine. The rules aren't always intuitive, and they vary slightly by country and airline. Here's a practical breakdown.
The Liquids Rule
In most countries, carry-on liquids must be in containers of 100ml (3.4oz) or less, all fitting in a single clear 1-liter resealable bag. This includes drinks, gels, creams, pastes, and aerosols. It doesn't matter if a bottle is half-empty, if the container is labeled over 100ml, it gets confiscated.
Exceptions: baby formula, breast milk, and prescription liquid medications are generally allowed in larger quantities, but you may need to declare them separately.
Batteries and Electronics
Lithium batteries have strict rules because they can catch fire. Spare lithium batteries and power banks must go in carry-on luggage, not checked bags. Most airlines allow batteries up to 100Wh without prior approval; between 100Wh and 160Wh usually requires airline approval; above 160Wh is generally prohibited.
Laptops, cameras, and phones are fine in both carry-on and checked bags when they're in devices. Loose batteries are the issue.
Food
Solid food is generally allowed in carry-on, a sandwich, snacks, fruit. The complications come at customs when you land, not at security when you depart. Many countries prohibit bringing in fresh produce, meat, dairy, or plant products from abroad. Australia and New Zealand are among the strictest. Declare anything you're unsure about, because undeclared prohibited food can result in fines.
Medications
Prescription medications should travel in their original labeled containers where possible. Carry a copy of the prescription or a doctor's note for controlled substances. Some medications legal in your home country are controlled or banned elsewhere. This is worth checking before you travel, not after.
Things That Surprise People
- Snow globes are prohibited in carry-on (liquid inside)
- Peanut butter and other nut butters is classified as a liquid/gel by TSA
- Knitting needles are generally allowed, but check airline policy
- Lighters are usually allowed in carry-on; not in checked bags
- Safety matches allowed in carry-on in some countries, not others
- Tools over 7 inches must go in checked baggage
Checked Baggage: What's Prohibited Everywhere
- Explosive or flammable materials
- Spare lithium batteries and power banks
- Compressed gases (except small medical oxygen with airline approval)
- Firearms without prior airline approval and proper declaration
Quick Pre-Flight Checklist
- Liquids in 100ml containers, all fitting in one clear bag
- Power banks and spare batteries in carry-on only
- Prescription meds in original containers with documentation
- Check customs rules for the destination, not just security rules at departure
- When in doubt, check the airline's website because rules vary