You know that moment at security when the line stops moving, and you crane your neck to see why? 9 times out of 10, it’s someone arguing with a TSA agent over a bottle of water they forgot to finish. I’ve been that person. Most of us have. Liquids on international flights sound like a simple rule until you’re actually at the checkpoint holding a half-empty shampoo bottle, wondering if it counts.
And here’s the annoying part: in 2026, the answer still depends on which airport you’re standing in, not just the airline you’re booked with. Let’s clear up the confusion once and for all.
Liquids on International Flights: What’s Actually Changed in 2026
There’s been a lot of noise online about the old rules disappearing. They haven’t, not everywhere. A few major UK airports (Heathrow, Gatwick, Edinburgh, Birmingham, Bristol, and both Belfast airports) now run CT scanners good enough that passengers can carry up to 2 litres per container without pulling anything out of their bag. Sounds great, right? Except that’s still the exception. Walk into most airports across the US, the EU, or smaller UK hubs like Manchester and Luton, and international flight liquid restrictions haven’t moved an inch; it’s still the same 100ml cap that’s been around since 2006.
What Actually Counts as a Restricted Liquid
Here’s where people get caught out. “Liquid” doesn’t just mean drinks. Security defines it far more broadly than most passengers assume, which is why liquids on international flights cause so much last-minute panic at the gate. Below is a list of the categories of drinks and what constitutes them.
| Category | Examples |
| Drinks | Water, Juice, Soda, Alcohol |
| Toiletries | Shampoo, Lotion, Perfume, Toothpaste |
| Semi-solids | Yoghurt, Honey, Jam, Hummus |
| Cosmetics | Liquid Foundation, Lip Gloss, Mascara |
| Gels & pastes | Hair Gel, Hand Sanitiser, Gel Deodorant |
Basically, if it pours, spreads, or sprays, it’s treated like a liquid even if it looks pretty solid sitting in the jar. Viscosity doesn’t matter. If it flows, then it goes.
So How Much Can You Actually Bring?
This is the part that trips people up most, and honestly, the international flight liquid limit isn’t one single number anymore; it changes depending on where you’re flying from.
| Airport Type | Limit Per Container | Bag Requirement |
| Standard (most global airports) | 100ml / 3.4oz | One clear resealable 1-litre bag |
| CT-scanner airports (select UK hubs) | Up to 2 litres | No bag required |
| US airports (TSA 3-1-1 rule) | 100ml / 3.4oz | One quart-sized bag |
Checked luggage is a different story; there’s no real liquid cap there, aside from the usual restrictions on flammable stuff. If you’re travelling with bulky toiletries, that’s still your best bet.
What About Water Bottles?
You can bring the bottle, skip the water. A full bottle gets tossed at most checkpoints because liquids on international flights include plain old tap water, no exceptions. What almost every seasoned traveller does instead is carry an empty bottle through security and fill it up at a fountain on the other side. At those handful of CT-scanner airports, this rule loosens up, but I wouldn’t bet on it unless you’ve checked your specific departure and connecting airports beforehand.
Travelling With a Baby? Here’s What You Need to Know
Parents get a bit of a break here. Baby milk, formula, and baby food are exempt from the usual liquid restrictions in nearly every country.
| Item | Allowed Quantity | Notes |
| Baby formula/milk | “Reasonable quantity” for the trip | No hard limit, but must be declared |
| Baby food/purees | Enough for the flight | May be opened for testing |
| Breast milk | Same as above | Allowed even if the baby isn’t travelling |
You don’t bury these at the bottom of your bag; officers sometimes ask to open or test them separately, so keep them within easy reach.
A Hack Most Travellers Never Hear About
Here’s a genuinely useful one: duty-free liquids bought after security are usually fine to carry onward, but only if they’re sealed in that tamper-proof bag, and you have your receipt. The catch? If your connection forces you through security again in a different country, that rule doesn’t protect you. Your expensive duty-free whisky can still get confiscated, receipt and all.
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The Smartest Way to Pack While Travelling Through Airports
If you take one thing from this, pack like liquids on international flights are still capped at 100ml everywhere, and treat any relaxed airport as a nice surprise, not as a norm because it’s far from it. The rules follow the airport, not the airline, and one connection can undo all your planning. Check your specific route before you fly, and keep baby milk and medication somewhere you can grab in two seconds flat.
Frequently Asked Questions
Does toothpaste count as a liquid?
Yes, for aviation security purposes, toothpaste counts as a liquid.
Are there still liquid restrictions on international flights?
Yes, strict liquid restrictions still apply to most international flights worldwide.
What toiletries are not allowed on a plane?
You cannot carry liquid, gel, or aerosol toiletries larger than 100ml (3.4 oz) in your carry-on luggage through airport security.
