Liquid limits in hand baggage are one of those elements of air travel that can surprise even experienced passengers. Suddenly it turns out that water, cream or perfume must meet specific rules, and exceeding them ends with things being thrown away at the security check. Although the basic 100 ml rule is similar across the whole world, the details differ depending on the airport and the region – and in 2025 and 2026 they've started to differ more than ever, as some airports lift the limit entirely while others keep it firmly in place.
Why do liquid limits in hand baggage exist at all
The restrictions on transporting liquids in hand baggage didn't appear by accident and aren't merely a bureaucratic nuisance for travellers. Their main aim is to increase the safety of commercial flights by limiting the risk connected with substances difficult to quickly identify during a check. In contrast to solid items, liquids can change their properties and mix in a way that makes them hard to assess without specialist tools.
The introduction of limits was a response to the need to create a simple, uniform system of control that could be applied at various airports regardless of the country. Thanks to this the procedure of checking hand baggage became more predictable both for the security services and for passengers. It was key to find a compromise between the effectiveness of the check and the fluidity of passenger flow, which at large airports is counted in thousands of people a day.
In practice, limiting the volume of liquids in individual containers significantly simplified the check process. Instead of analysing every substance individually, the services can apply standardised procedures that reduce the time of check-in and limit the risk of errors. It's precisely why this system, although it can be a nuisance for travellers, became a global standard in civil aviation.
What led to the introduction of global restrictions?
The direct impulse for the introduction of restrictions were incidents connected with attempts to bring onto a plane liquid substances of a potentially dangerous character. In response, the organisations responsible for aviation safety developed common rules that could be implemented simultaneously in many countries.
What was important was not only increasing the level of safety, but also unifying procedures, so that passengers travelling internationally wouldn't have to grapple with completely different rules at every airport. Thanks to this the security check became more coherent, and the risk of misunderstandings significantly decreased.
Where the 100 ml limit came from
The 100 ml limit in hand baggage isn't a random simplification or an arbitrary decision that appeared without analysis. It's the effect of many years of experience of aviation security services, which had to find a solution combining two contradictory goals: maximally increasing the level of control and maintaining the fluidity of passenger flow at airports. In practice this meant the necessity of creating a rule that could be implemented globally, regardless of the technical infrastructure of a given country.
The key assumption was moving away from analysing every liquid substance as potentially dangerous and shifting to a control model based on the standardisation of containers. Instead of checking the contents of every package in a laboratory way, the security check began to rely on the quick recognition of the volume and form of the transported liquid. Thanks to this the check-in process could be significantly sped up, which had huge importance at large airports serving thousands of passengers a day.
The introduction of the 100 ml limit was also a response to the problem of so-called "distributed transport," that is a situation in which a larger amount of substance could be divided into many smaller containers. Safety analyses showed that overly large permitted capacities of individual packages would increase the risk, because it would be harder to control their total content. It's precisely why a solution based on small, easy-to-assess units was adopted.
An important aspect was also the unification of rules on an international scale. Earlier, different countries applied their own interpretations regarding the transport of liquids, which led to misunderstandings and problems on international flights. The introduction of a common 100 ml standard allowed the creation of a uniform point of reference for passengers regardless of which airport they depart from and where they're heading.
From the passenger's perspective, it's also important that the 100 ml limit doesn't concern only the volume of the liquid itself, but also the container in which it's found. This means that even a partially used bottle of a larger capacity still won't be allowed through the check in hand baggage. It's one of the most frequent traps that causes confiscations at the security gates.
It's also worth paying attention to the practical aspect: the 100 ml limit wasn't chosen as a minimum value, but as a compromise between usefulness and safety. Such an amount allows you to take basic cosmetics or hygiene liquids on a short flight, while at the same time limiting the possibility of transporting larger volumes that are harder to check quickly.
Why exactly 100 ml, and not another value?
The choice of 100 ml resulted from a combination of risk analyses and operational tests conducted at airports. From the point of view of safety it was assumed that small amounts of liquids significantly limit the potential threat, while at the same time being sufficient for the daily needs of passengers during a trip. It was key to find a value that would be intuitive and easy to enforce in practice.
Equally important was the matter of standardisation. The choice of a round value, such as 100 ml, allowed the avoidance of complicated conversions and differences of interpretation between countries. Thanks to this the rule became a global point of reference that can be easily communicated to passengers regardless of language or region of the world.
Ultimately the 100 ml limit became not only a tool of safety, but also an organisational element that brought order to the process of checking hand baggage across the whole world.
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The European standard – rules applying in the EU
In the European Union the rules on transporting liquids in hand baggage are among the most rigorous and at the same time the most uniform in the world. They cover not only the volume limit of an individual container, but also the way of packing all liquids and presenting them during the security check. In practice this means that the passenger can't treat cosmetics, drinks or other liquid substances as freely transported products, even if their amount seems small.
The basic rule applying in the EU says that every liquid must be transported in a container of a maximum capacity of 100 ml, and all such containers must fit in one transparent, resealable bag of a capacity of up to 1 litre. This bag must be easily accessible during the check and presented separately, regardless of the rest of the hand baggage. This solution was introduced in order to shorten the time of the check and unify the way of checking the contents of passengers' baggage.
In practice European airports apply very similar procedures, though they may differ in organisational details. The approach itself, however, remains common: limit the amount of liquids to a level that can be quickly verified without the need for advanced chemical analysis on the spot. Thanks to this the security check is more predictable and less prone to delays resulting from manually checking every bottle.
It's also worth noting that the definition of a "liquid" in airport practice is broader than it might seem. It's not only about water or drinks, but also about many products of a gel, paste or aerosol consistency. It's precisely this category that causes travellers the most problems, because it's often not intuitively associated with the restrictions on liquids.
Which products are treated as liquids?
In the practice of the security check, liquids are considered to be not only substances in their classic, watery form, but also products of a similar consistency. This means that many everyday items used in travel are subject to the same restrictions, even if they don't look like typical liquids.
- cosmetics, such as creams, lotions and gels
- drinks, including water, juices and alcohols
- pastes, for example toothpaste
- aerosols, including deodorants and hairsprays
- gels, including hygiene and care products
This broad definition means that passengers often unknowingly try to transport items covered by restrictions. It's precisely why appropriate preparation of hand baggage is so important even before arriving at the airport, because most problems appear only at the stage of the security check. If cosmetics are your main concern, it's worth seeing our separate guide on how to pack cosmetics for a plane, which goes through the liquid rules product by product.
The United States – TSA rules
In the United States the rules on transporting liquids in hand baggage are largely similar to the European ones, however they function in a slightly different system of security control. The Transportation Security Administration, that is the TSA, is responsible for enforcing them, applying uniform standards at all airports in the country. Thanks to this passengers travelling around the USA deal with a fairly coherent set of rules, regardless of the specific airport.
The basic TSA rule assumes the limitation of the amount of liquids to containers of a maximum volume of 3.4 ounces, which corresponds to roughly 100 ml. This means that in practice the limit is almost identical to that in the European Union, though expressed differently in units. The difference therefore doesn't lie in the value itself, but in the way of organising the check and the additional security procedures.
The TSA calls this the "3-1-1" rule: containers of up to 3.4 ounces (1), all fitting in one quart-sized transparent bag (1), one bag per passenger (1). In contrast to Europe, the way it's enforced can feel slightly more flexible at some checkpoints, but the core requirement – small containers, presented for screening – stays the same. Most passengers still use the single transparent bag, because it eases passing through the check.
The American system is also more flexible in terms of the interpretation of certain exceptions and additional procedures, however the basic rule regarding small containers remains unchanged. Thanks to this travellers between Europe and the USA don't have to learn completely new restrictions, which significantly eases international travel.
How does the TSA differ from European checks?
The most important difference between the TSA and European regulations doesn't lie in the liquid limit itself, but in the way of organising the security check. In Europe greater emphasis is placed on a uniform model of packing liquids in transparent bags, whereas in the USA the procedures can be more varied depending on the airport and the scanning technology used.
In practice this means that a passenger in the United States may encounter slightly different operational requirements, but the final effect remains similar – limiting the amount of liquids in hand baggage and their quick verification during the check. These differences result mainly from the organisation of the security system, and not from fundamentally different rules.
The United Kingdom and the modernisation of security checks
The United Kingdom for years applied rules very similar to the EU ones, however recently it has become one of the first regions to really start changing its approach to liquid limits in hand baggage. A key role is played here by the implementation of modern CT scanners, which allow a more accurate analysis of the baggage contents without the need to apply restrictions as restrictive as before.
In the traditional control model liquids were a problem, because their quick identification was limited by the technology of X-raying baggage. The new scanners enable a three-dimensional analysis of the bag's contents, which significantly increases the precision of detecting potential threats. Thanks to this some airports in the United Kingdom began to gradually move away from the rigorous application of the 100 ml limit.
These changes, however, aren't introduced simultaneously at all airports – and this is the single biggest source of confusion in 2026. At airports with fully approved CT scanners, the 100 ml limit has been replaced by a far more generous allowance of up to 2 litres per container, with no need to take liquids out of the bag or pack them in a transparent bag. At others, even where the scanners are physically installed, the old 100 ml rule still applies because full regulatory approval hasn't yet been granted.
As of early 2026, the 2-litre allowance applies at airports including London Heathrow (all terminals), Gatwick, Birmingham, Bristol and Edinburgh. Meanwhile several major airports – among them Manchester, Luton and Stansted – still enforce the 100 ml limit, even though many of them already have the scanners in place. The rollout is happening in phases and the list changes over time, so the only safe approach is to check the rules on your specific departure airport's website shortly before flying.
There's also one practical catch worth knowing even at "2-litre" airports: metal or double-walled containers, such as vacuum flasks and insulated bottles, still have to be emptied before the check, because the scanners can't fully see through the insulation. An innocent thermos full of coffee can therefore still trigger a manual search or have to be poured out.
How to handle a connecting flight?
The crucial point is that the lifting of the limit applies only at the airport of departure. If you fly from a "2-litre" airport but change planes at one that still enforces 100 ml – or in a country that hasn't relaxed the rules – your larger liquids will be confiscated at the transfer security check. For journeys with a connection, it's therefore safest to assume the strictest rule on the whole route, that is 100 ml, unless you're certain every airport on the way allows more.
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Duty free and buying liquids after the check
The duty-free zone is for many travellers the moment when the restrictions on liquids cease to be felt. After passing the security check you can buy drinks, cosmetics or alcohols without the classic 100 ml limits, because they're no longer treated as an element of hand baggage in the understanding of the security check. What's crucial, however, is that different rules on packing and transporting these products apply here, especially on flights with transfers.
Purchases in duty free are usually packed in special, secured bags of the STEB type (Security Tamper-Evident Bag), which are meant to make it impossible to open them without leaving traces of tampering. Thanks to this the security services at other airports can quickly assess whether a product was bought after the check and whether it wasn't swapped. This solution allows the balance between freedom of shopping and the requirements of aviation safety to be maintained.
The problem appears, however, when the trip includes a transfer. In such a case the passenger may again pass through a security check, and then the duty-free bag may be subjected to additional verification. Depending on the country and the airport, a lack of appropriate securing may mean the necessity of again applying the standard liquid limits.
In practice this means that although duty free gives greater freedom, it doesn't always eliminate the restrictions fully. A lot depends on the route of the trip and the procedures applying at the next airport. The golden rule: keep the STEB bag sealed and the receipt inside it until you reach your final destination – opening it early, even just to take a sip, can mean losing the contents at the next check.
Why must the bag be sealed?
The secured duty-free bag performs an evidential function, confirming that the purchase was made after the security check. The seal and the receipt placed inside allow the services to quickly verify the origin of the product without the need to open it.
This solution is aimed at avoiding a situation in which liquids bought outside the security check could be brought onto a plane without restrictions. Thanks to this the system maintains coherence and still fulfils its protective functions.
Exceptions to the liquid limits
Although the 100 ml rule is one of the most restrictive rules applying in hand baggage, the aviation safety system provides for specific exceptions. They result from the practical needs of passengers for whom access to certain liquids during the trip is necessary for health or caregiving reasons. In such cases the possibility of proving the legitimacy of transporting a larger amount of liquid is of key importance.
The most frequently encountered exceptions concern medicines, food for infants and medical liquids. In contrast to standard cosmetics or drinks, these products can be transported in amounts exceeding 100 ml, provided that their use is justified and declared during the security check. The airport personnel may ask for them to be shown or for additional verification, however they aren't subject to automatic confiscation.
In practice this means that the passenger isn't completely limited by a rigid rule, but must be prepared for additional questions or a check. In many cases a basic explanation is enough, however with larger amounts or non-standard situations medical confirmation may be required.
How to declare an exception during the check?
In the case of transporting medical liquids or food for a child, it's key to separate them from standard cosmetics even before the security check. Thanks to this the personnel can quickly identify which items require additional verification.
In some cases it's also recommended to have medical documentation, especially if medicines are transported in larger amounts or specialist preparations. This eases the check process and reduces the risk of misunderstandings.
- prescription medicines
- milk for infants
- medical liquids and specialist preparations
Each of these exceptions is treated individually, and the final decision always belongs to the security services at the airport, which assess the situation in the context of the applicable regulations.
Modern CT scanners and the future of liquid checks
One of the most important directions of change in aviation security checks are the new-generation CT scanners, which are gradually replacing older systems of X-raying baggage. Their key advantage is the possibility of creating a three-dimensional image of the suitcase's contents, which allows a more accurate analysis of the structure of items without the need to physically take them out. In practice this means greater precision and a smaller number of false alarms.
In the context of liquids this change has particular significance, because until now it was precisely the technological limitations that were one of the main reasons for maintaining the 100 ml limit. Older scanners didn't always allow the unambiguous recognition of liquid substances in larger containers, which forced the application of simple, universal rules. The new devices eliminate part of these limitations, opening the way to more flexible regulations.
The process of implementing this technology isn't, however, uniform and depends on the pace of modernisation of individual airports. Airport infrastructure requires large investments, as well as the training of personnel, which is why the changes are introduced gradually. As a result passengers may encounter different rules even within the same country.
In the longer perspective the development of CT scanners may completely change the way liquids in hand baggage are checked. Instead of rigid volume limits it'll be possible to have a more individual approach based on the real analysis of the baggage contents.
Will the 100 ml limit be abolished?
The abolition of the 100 ml limit is one of the most frequently raised subjects in the context of airport modernisation, however it's not an instant process. Although scanning technology develops dynamically, global regulations require time to be changed and implemented in a coherent way across the whole world.
In practice this means that for the coming years passengers will still have to follow the current rules, especially at airports that haven't yet been equipped with modern CT systems. Only the full implementation of the technology could open the way to moving away from the rigid limit. And as the UK example shows, even where the scanners are installed, the relaxed rules don't follow automatically – regulatory approval comes separately and airport by airport.
Comparison of the rules in various regions of the world
Although the basic 100 ml limit is today the most recognisable standard, its application and enforcement differs depending on the region of the world. This results above all from the level of development of airport infrastructure, the available scanning technologies and local safety regulations. In practice this means that a passenger travelling between continents may encounter a different approach to the same rules.
In Europe and in a large part of Asia a very similar control model applies, based on containers of up to 100 ml and a transparent bag of a capacity of 1 litre. The United States applies similar limits, but organises the check process differently, placing greater emphasis on the TSA system. In the United Kingdom, in turn, and at selected airports, solutions based on CT scanners are already appearing, which may in the future completely change the existing rules.
| Region | Liquid limit | Bag requirement | Exceptions | Scanning technology | Flexibility of rules |
|---|---|---|---|---|---|
| EU | 100 ml | Yes, 1 litre | Yes (medicines, infants) | Standard + CT being rolled out | Low |
| USA | 100 ml (3.4 oz) | Usually recommended | Yes | Standard TSA | Medium |
| United Kingdom | 100 ml (partly lifted, up to 2 l at some airports) | Depends on the airport | Yes | CT at selected airports | High (variable) |
| Asia | 100 ml | Yes | Yes | Standard + modernisations | Medium |
These differences don't result from a lack of common standards, but from the pace of implementing new technologies and local safety priorities. As a result, globally a similar logic applies, however the details may differ significantly depending on the airport.
The most common mistakes travellers make with liquids
Problems with liquids in hand baggage are among the most frequent reasons why passengers lose their things during the security check. In most cases this doesn't result from ill will, but from ignorance of the detailed rules or their incorrect interpretation. Even people who travel often can make basic mistakes that end with the confiscation of cosmetics, drinks or other products.
One of the most frequent problems is transporting liquids in packages larger than 100 ml, even if they're partially empty. The security check doesn't take into account the amount of the content, but the capacity of the package itself, which for many people is still counterintuitive. Another mistake is the lack of appropriate preparation of the wash bag, which results in the necessity of repacking things at the gate.
Equally often passengers forget that products bought outside the airport are still subject to the standard restrictions if they aren't appropriately packed in the duty-free zone. The problem also appears during transfers, where repeated security checks and different interpretations of the regulations apply.
- transporting bottles larger than 100 ml
- confusing liquids with solid products
- lack of a transparent bag for liquids
- ignoring the rules during transfers
- opening sealed duty-free purchases
- taking full cosmetics "just in case"
- assuming a "2-litre" departure airport means liquids are fine for the whole journey
- forgetting to empty a metal or insulated water bottle before the check
Awareness of these mistakes lets you significantly shorten the time of the check and avoid needless losses. In practice a few simple habits are enough to make passing through security fast and trouble-free.
How to correctly pack liquids in hand baggage
The appropriate packing of liquids in hand baggage in practice decides whether the security check will go quickly and without problems. It's key not only to meet the formal requirements, but also to order things in such a way that during the check you don't lose time on repacking and looking for individual products. A well-prepared wash bag can really shorten the whole check-in process.
The basis is separating all liquids even before packing the suitcase. This means taking out cosmetics, drinks and other products in gel form, and then checking their capacity. Even a small exceeding of 100 ml in one package means that the given product won't pass the check, regardless of how much is actually inside.
It's also important to use one transparent bag of appropriate dimensions, which allows the contents to be quickly presented during the check. Thanks to this the security personnel can in a few seconds assess whether the set meets the requirements, without the need to search the whole hand baggage.
- choose containers of up to 100 ml
- place all liquids in one transparent bag
- check the tightness of the packages
- separate cosmetics from the rest of the baggage
- secure products against leakage
- place the bag on top of the baggage
A set prepared in this way significantly reduces the risk of problems at the check and lets you avoid nervous situations at the security gates. In practice it's precisely the organisation, and not the amount of liquids itself, that has the greatest impact on the comfort of the trip.
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Checklist before the security check
The last stage of preparing hand baggage before the security check consists of a quick check of whether all the rules on liquids have been met. In practice it's precisely the lack of one small element that most often leads to the necessity of throwing things away or an additional check. That's why a short, ordered checklist lets you avoid needless problems and stress at the gate.
- Every liquid is in a container of up to 100 ml
- All containers fit in one transparent bag
- The bag has a capacity of no more than 1 litre
- The bag is easily accessible in the hand baggage
- Gel products, creams and aerosols have been checked
- Duty-free purchases are packed and sealed
- Medicines and medical liquids are separated and declared
- No full bottles above 100 ml
- The bag with liquids is ready to be taken out separately
A checklist prepared in this way lets you verify the most important elements in a few seconds and minimise the risk of delays. In practice it's precisely the consistent application of these rules that makes the security check go smoothly, even at large and crowded airports. And if you're departing from one of the airports that have lifted the 100 ml limit, this list simply becomes shorter – but it never hurts to be ready for the strict version, especially with a connection.
FAQ – the most frequent questions about liquid limits
Do perfumes count as a liquid?
Yes, perfumes are treated as a liquid and are subject to the standard restrictions on hand baggage. This means they must be in a container of up to 100 ml and placed in a transparent bag of a capacity of up to 1 litre. Even if the bottle is partially used, its total capacity still counts. You'll find more detail in our guide on whether you can transport perfume on a plane.
Can you transport water in a bottle?
You can transport water in hand baggage only if it meets the requirements for liquids, that is it's in a container of up to 100 ml and fits in the allowed bag. Bottles bought before the security check, if they're larger, have to be emptied or thrown away. The exception is drinks bought after passing the check – and, at airports that have lifted the limit, larger bottles up to 2 litres.
Are medicines subject to the limits?
Liquid medicines can exceed the 100 ml limit if their transport is medically justified. In most cases it's required to declare them during the security check, and sometimes also to show medical documentation or a prescription. The airport services may carry out an additional verification, but medicines aren't confiscated as standard.
What about food for children?
Food and milk for infants also constitute an exception to the standard liquid limits. They can be transported in amounts necessary for the duration of the trip, however they must be declared during the check. In some cases the airport personnel may ask for them to be opened or checked.
Can I rely on the 2-litre rule everywhere now?
No. The relaxed allowance applies only at specific airports with approved CT scanners, and only on the departure leg. At many airports the 100 ml rule is still firmly in force, and on a journey with a transfer the strictest airport on the route effectively decides what you can carry. Always check your specific departure (and connecting) airport before you fly. For a fuller rundown of what is and isn't allowed in the cabin beyond liquids, see our guide on items you can't bring on a plane, and if you're flying a budget carrier it's worth reviewing the Ryanair cabin baggage rules too.
