Right, quick confession before we get into it: the last time I flew out of Heathrow, I stood at security bracing for the usual palaver, decanting shampoo into tiny bottles, wrestling the clear plastic bag shut with the zip half-jammed like always. And nothing happened. No bag. No 100ml drama. Just my normal-sized suncream and a full bottle of contact lens solution sailing through the scanner like it was nothing.
I stood there for a second like an idiot, half expecting someone to shout at me. They didn’t. That’s when it actually clicked that this whole thing has genuinely changed, at least somewhere. But here’s the bit that trips people up, and the reason I’m rewriting this whole guide from scratch: it hasn’t changed everywhere. Not even close. If your next flight is from an airport that hasn’t finished its upgrade, you’re still very much in 100ml territory, plastic bag optional now but limit very much intact.
So let’s sort out what’s actually true, airport by airport, and what to do about the bit nobody warns you about: your return flight.
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UK 100ml liquid rule: Quick Facts
The 100ml rule isn't gone across the board, only at airports with new CT scanners installed and officially approved.
Heathrow, Gatwick, Edinburgh and Birmingham currently allow containers up to 2 litres, with a few smaller airports following the same path.
Manchester, Stansted, Luton, Liverpool and Glasgow still enforce the old 100ml limit for now.
You no longer need a clear plastic bag at any major UK airport, whichever limit applies to you.
Your return or connecting airport's rules apply on the way home, not the rule you flew out under.
Vacuum flasks and metal bottles still need to be empty, even at the airports allowing 2 litres.
Tinker's Tip: Pack to the strictest airport on your trip, not the most generous one. If either your outbound or return leg still runs the old 100ml rule, treat the whole journey as a 100ml trip. It's the only packing strategy that never bites you.
What Actually Changed (and Why It Took So Long)
The 100ml rule has been knocking around for nearly two decades now, brought in after security services uncovered a plot to smuggle liquid explosives disguised as soft drinks onto transatlantic flights. It was a blunt, sweeping response to a genuine threat, and for all that time it’s meant the same faff for every single one of us: 100ml containers, one small clear bag, out of your hand luggage at the tray.
The thing that’s finally cracking it open is new CT scanning technology, the same sort of kit used in hospital imaging. These scanners build a proper 3D picture of what’s inside your bag, detailed enough that security staff can tell the difference between a bottle of gin and a bottle of trouble without opening either one. Where an airport has installed this kit and had it formally signed off, the old volume cap stops serving much purpose, so it gets dropped.
Good to know though: this hasn’t been a smooth, straight line. A batch of early scanner approvals across Europe got pulled back a while ago over a technical certification issue, which sent a few airports briefly back to the old 100ml rule after they’d already relaxed it. Recertified kit has since been signed off, and the rollout is moving again, but it explains why some of the headlines you’ve seen have felt contradictory.
Which UK Airports Have Scrapped the 100ml Rule (And Which Haven't)
Here’s the honest, unglamorous truth: this is a rolling list, not a finished one. Airports get their scanners certified in batches, so the split below reflects where things stand right now, and it’s genuinely worth double checking your specific airport’s security page close to your travel date, because more airports keep joining the 2-litre group.
← Swipe to scroll on mobile
| Airport | Liquid Limit | Clear Bag Needed? |
|---|---|---|
| Heathrow (all terminals) | 2 litres | No |
| Gatwick | 2 litres | No |
| Edinburgh | 2 litres | No |
| Birmingham | 2 litres | No |
| Bristol & Belfast (both) | 2 litres | No |
| Manchester | 100ml | No, but still capped |
| Stansted | 100ml | No, but still capped |
| Luton | 100ml | No, but still capped |
| Liverpool & Glasgow | 100ml | No, but still capped |
A few smaller regional airports, London City and Teesside among them, were actually some of the earliest to test this scanner tech, so don’t be shocked if you find one of them quietly running the new limit too. And most of the wider short-haul network, East Midlands, Newcastle, Aberdeen and plenty of others, are still working through their own upgrades. Manchester tends to be the one that surprises people, given how big it is, but as things stand it’s firmly in the 100ml camp.
- If you’re not sure which camp your airport falls into, check its own security page directly rather than trusting a general headline. “UK liquid rules have changed” doesn’t mean your specific airport has.
- Bookmark the page for your regular departure airport. This is genuinely one of those things that gets updated with very little fanfare.
Old Rule vs New Rule: What Actually Changes at Security
It’s not just the volume cap that shifts once an airport gets its scanners. The whole rhythm of going through security changes with it. Here’s the side by side.
← Swipe to scroll on mobile
| What Changes | Old 100ml Rule | New 2 Litre Rule |
|---|---|---|
| Container size | Max 100ml each | Up to 2 litres each |
| Clear plastic bag | Not required anywhere now | Not required |
| Number of containers | Fits in the small bag, roughly 1 litre total | No set cap on how many, each under 2 litres |
| Laptops/electronics | Usually removed separately | Stay in your bag |
| Vacuum flasks | Must be empty | Must still be empty |
Fact: Even at airports still running the 100ml rule, that clear plastic bag has quietly disappeared. You can leave everything inside your normal cabin bag at the tray, whichever limit applies to you.
The Return Flight Catch Nobody Warns You About
This is the part that genuinely catches people out, and I mean people who think they’ve done their homework. The rule that applies is the rule at the airport you’re leaving from. Not your destination. Not the airport you flew out of a week earlier. The one under your feet, right now, at security.
So say you fly out of Heathrow with a lovely full-size bottle of shower gel, no bother, 2 litre rule, sailed through. You use half of it on your trip. You’re now flying home from an airport that still runs 100ml. That bottle, no matter how much is left in it, gets binned. Not confiscated and posted back to you. Gone.
Same goes for connecting flights where you pass through security again partway through your journey. If the connection airport is still on the old rule, it doesn’t matter what you were allowed to carry on the first leg.
- Plan your packing around the strictest airport on the whole itinerary, not the one you’re most excited about.
- If you genuinely don’t know your return airport’s rule yet, default to 100ml. It’s annoying, but it’s never wrong.
- Keep a small clear bag in your hand luggage as a backup even at 2-litre airports. Costs nothing, and if there’s a system fault or a manual recheck on the day, you’ll be glad it’s there.
This is also exactly the kind of disruption that eats into your connection time. If security queues are running long because an airport’s mid-rollout and staff are dealing with confused passengers (and there are always a few), it’s worth having flight compensation in the back of your mind if a knock-on delay actually costs you your onward flight.
Duty-Free Liquids and Connecting Flights
Buying duty-free after security is its own separate world, and it’s worth understanding because it trips people up almost as often as the return-flight catch does.
Anything you buy airside, past the security checkpoint, gets sealed by the retailer into a Security Tamper Evident Bag, usually shortened to a STEB. It’s a clear, sealed bag with your receipt visible inside. That seal is genuinely what allows a full bottle of spirits or a large duty-free perfume through a checkpoint that would otherwise refuse it outright, whichever limit applies there.
The rules around it are strict, and fair enough really:
- Don’t open the bag until you reach your actual final destination.
- Keep the receipt inside and visible at all times.
- Any sign of tampering and it can be refused at your next checkpoint.
Where this gets messy is connecting flights. If you have to clear security again at a connection airport, and particularly on routes that cross in and out of different customs zones, that STEB bag can sometimes get confiscated even though you did everything right when you bought it. My honest advice, buy duty-free at your final departure point rather than an earlier stop if you can help it, and if your journey has a connection, check that specific route’s rules before you buy anything you’d be gutted to lose.
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Browse the shopWhat's Still Exempt, Whatever Rule Your Airport Runs
Whichever limit applies where you’re flying from, some things are treated differently, and always have been.
- Baby milk, formula and food: allowed in larger quantities for the journey. You may be asked to taste it, which feels a bit odd the first time but is entirely normal.
- Prescription and essential medication: including liquid medicines and insulin. Bring proof where you can, a prescription or a doctor’s letter helps if you’re carrying more than the standard amount.
- Special dietary liquids where medically required.
If you’re travelling with little ones, it’s worth reading our family packing list alongside this one, because baby items have their own quirks that go well beyond just the liquids question.
Good to know: None of these exemptions get you out of the vacuum flask rule. Even insulated baby bottles and flasks generally need to be empty at the tray, then filled after security if there’s water available airside.
How This Compares to the Rest of the World
Worth zooming out here, because plenty of us aren’t just flying domestically. The UK is actually leading the pack on this one, which honestly still catches me off guard a bit given how slow some of this kind of infrastructure change usually moves.
← Swipe to scroll on mobile
| Region | Current Limit | Notes |
|---|---|---|
| UK (upgraded airports) | 2 litres | Heathrow, Gatwick, Edinburgh, Birmingham & more |
| UK (other airports) | 100ml | Manchester, Stansted, Luton & others |
| European Union | Mostly 100ml | A handful of airports with certified scanners allow more |
| USA | 100ml (3.4oz) | The 3-1-1 rule, no relaxation at any checkpoint |
| Rest of the world | Mostly 100ml | The traditional rule remains the global default for now |
So if your trip involves a US leg at any point, don’t even think about the 2 litre rule. The States are sticking firmly to 100ml with genuinely zero flexibility, whatever your UK departure airport allows you to carry. Same logic really, for most of Europe, Asia and beyond. The UK’s ahead of the curve, not the global standard.
My Honest Packing Strategy Right Now
Here’s the thing. Even though I now fly out of an airport with the 2 litre rule fairly regularly, I still mostly pack like it’s 100ml. Not because I’m precious about it, but because it’s just less admin. Full-size bottles are heavier, they take up more space, and half the time my return flight or a connection somewhere is still on the old system anyway.
Where I do use the bigger allowance now: a proper full-size suncream on beach trips, because decanting suncream is genuinely one of my least favourite packing chores, and a full contact lens solution bottle, because running out mid-trip is a nightmare I’ve lived through more than once.
Worth a quick word on cost too, since getting this wrong isn’t free. A confiscated bottle of decent suncream or a half-used perfume can easily run you £20 to £30 (roughly €23 to €35, or $25 to $38) to replace once you land, and airport shops are never the cheap option. Prices are rough estimates and will vary by brand, retailer and destination, but the maths on double checking your airport’s rule before you fly is pretty easy.
And honestly, give yourself more buffer time than you think you need whenever an airport is mid-rollout. Staff are often still bedding in new processes, queues can behave unpredictably, and a rushed security experience is a miserable start to a holiday. If you’re cutting it fine and want one less thing to stress about on the way there, booking an airport transfer instead of gambling on parking or public transport timings takes at least one variable off the table.
Must-do: Check your exact departure and return airports directly before you fly, not a general news article, not this one either. The rollout genuinely moves fast enough that an airport on the 100ml list can shift to 2 litres with very little notice.
It’s also worth having proper cover in place regardless of which rule applies to you. A confiscated item is annoying, but it’s small change compared to a genuine disruption, a missed connection, a delay that wrecks the first day of your trip. Decent travel insurance won’t get your shampoo back, but it covers the stuff that actually matters if your journey goes properly sideways.
One more thing while you’re thinking about hand luggage generally: liquids are only one part of the puzzle. If you’re travelling carry-on only, it’s worth reading our guide to packing carry-on only so the rest of your bag is sorted too, and if you’re not sure what else is and isn’t allowed through security, our guide on what you can take in hand luggage covers everything from scissors to selfie sticks. Flying with a laptop, power bank or other electronics is its own small minefield too, worth a look at our guide on power banks on planes before you pack.
The Bottomline
Right, that’s genuinely everything I’d want to know before heading to the airport myself.
The short version: check your specific airport, pack to the stricter end of your journey, and don’t get too excited about that 2 litre allowance until you’ve confirmed your return leg matches it. For more on getting through security without the stress, have a browse of our full packing tips hub for everything else worth sorting before you fly. Safe travels! ✈️
FAQs
Is the 100ml liquid rule gone in the UK?
Not everywhere. It’s been lifted at airports with newly certified CT scanners, Heathrow, Gatwick, Edinburgh and Birmingham among them, but plenty of other UK airports, including Manchester, still enforce the old 100ml limit.
Which UK airports allow 2 litres of liquid now?
Heathrow, Gatwick, Edinburgh and Birmingham currently allow up to 2 litres per container, along with Bristol and Belfast’s two airports. A few smaller regional airports may have upgraded too, so it’s always worth checking directly.
Do I still need a clear plastic bag for liquids at UK airports?
No. Every major UK airport has dropped the clear plastic bag requirement, no matter if it’s still running 100ml or has moved to the 2 litre rule.
What happens if my return or connecting airport still uses the 100ml rule?
The rule that applies is always set by the airport you’re currently departing from. A bottle allowed out through a 2 litre airport can be refused and binned at a return or connecting airport that still runs 100ml.
Can I take vacuum flasks or metal water bottles through security now?
Only empty. CT scanners can’t see clearly through double-wall insulation, so even at airports with the 2 litre rule, flasks and insulated bottles need to be empty at the tray and filled up again afterwards.
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Nick Harvey
Hi, I’m Nick. I take the photos, book the wrong hotel occasionally, and write it all up so your trip goes better than mine did. The Travel Tinker exists because I got tired of guides that had clearly never been anywhere.
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