
When travelling with hand luggage, there are restrictions on the amount of liquids you can take on board. Liquids must be in containers smaller than 100ml (or 3.4 ounces) and must be placed in a clear, resealable plastic bag. Most airports provide these bags, but you can also use your own, such as a makeup bag or a freezer bag. The bag must be no larger than 20cm x 20cm, and passengers are limited to one bag each. Some liquids, such as medicines and baby food, are exempt from these rules, but you may need to provide a prescription or doctor's letter.
| Characteristics | Values |
|---|---|
| Container size | Containers must be no larger than 1 litre and measure approximately 20cm x 20cm |
| Container type | Clear, resealable plastic bag |
| Container contents | Liquids, gels, and aerosols |
| Container contents size | Containers must be 100ml or less |
| Number of bags allowed | One bag per person |
| Exemptions | Medication, baby food, duty-free liquids, food for special dietary requirements |
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What You'll Learn

Liquids must be under 100ml
When going through airport security, it is important to remember that any liquids you wish to take on board must be in containers with a capacity of no more than 100ml. This rule applies to all liquids, including drinks, creams, pastes, gels, aerosols, and even food items that fall into these categories, such as yoghurt, pudding, and peanut butter. Each passenger is allowed a single 1-litre bag for these items, which must be transparent and resealable. The bag should ideally measure 20cm x 20cm, although bags measuring 15.24cm by 22.86cm (6 inches by 9 inches) or 20cm by 17.5cm (8 inches by 7 inches) are also acceptable.
The 100ml limit is a widely applied standard, with some variations depending on the country and airport. At most airports, you cannot take liquids in containers larger than 100ml through security, even if the container is only partially filled. However, some airports may allow containers holding up to 2 litres of liquid. It is always best to check the specific rules of your departure airport before travelling. Countries outside of your departure country may have different rules for transit or transfer passengers, so it is important to be aware of these regulations as well.
There are some exemptions to the 100ml rule. Baby milk, food, and drinks are allowed in quantities greater than 100ml for infants under two years old. Medicines are also typically exempt, but you may need a prescription or doctor's letter to prove that these liquids are medically necessary. Similarly, liquids for special dietary requirements may be permitted with appropriate documentation. Duty-free liquids purchased at the airport or on a plane are usually allowed through security, provided they remain sealed inside a security bag.
It is important to note that airport security staff have the final say on what is allowed through security. They will not permit anything they consider dangerous, even if it is typically allowed in hand luggage. To streamline your security screening experience, ensure that all liquids comply with the size and quantity restrictions and are packed in a separate, transparent bag. Additionally, avoid packing gifts or souvenirs containing liquids in your carry-on baggage, as these will need to be placed in checked baggage or shipped separately.
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Only one clear bag per person
When travelling with hand luggage, only one clear bag per person containing liquids is permitted. This rule applies to all passengers, and it is important to adhere to it to ensure a smooth journey through airport security. The allowance of one clear bag per person is a standard regulation across many airports, including Manchester Airport in the UK.
This regulation is in place to facilitate the screening process and maintain safety. The clear bag rule is specifically for liquids, gels, and aerosols, which must be in containers of no more than 100ml each. These items need to be easily visible and accessible for security staff to examine. The clear bag must be resealable, such as a makeup bag or a freezer bag, and it should not exceed a litre in volume or 20cm by 20cm in size.
It is important to note that the one clear bag per person rule is separate from your hand luggage allowance. This means that you can bring additional hand luggage, such as a handbag or laptop bag, in addition to your clear bag of liquids. However, any electrical items exceeding 20cm by 20cm should be removed from your hand luggage and placed in a separate tray for screening.
While the one clear bag per person rule is standard, there may be slight variations in its implementation across different airports and countries. It is always advisable to check with your airline and the specific airports you are travelling through to ensure you comply with their regulations. Some airports may provide clear bags at security if you forget to bring your own, but it is recommended that you prepare your liquid bag in advance to expedite your passage through security.
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Medicines are exempt from rules
While there are restrictions on the amount of liquids you can take in your hand luggage, medicines are exempt from these rules. This applies to liquid medicines, as well as gels and aerosols. However, you must declare these items to TSA officers at the checkpoint for inspection.
If you are carrying liquid medicines in containers larger than 100ml, you will need a prescription or a doctor's letter to prove that you need them. These larger containers will be tested for compliance, and you may need to prove that the medicines cannot be purchased from a retailer.
Medicines should be placed in a separate, transparent, resealable plastic bag, which holds no more than a litre and measures approximately 20cm x 20cm. The contents must fit comfortably inside the bag so that it can be sealed. This bag should be placed inside your hand luggage.
It is important to note that different countries may have different rules regarding carrying liquids on flights, so it is always best to check with the relevant airlines and airports before travelling. Additionally, airport security staff have the discretion to not allow any item they consider dangerous on board, even if it is usually allowed.
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Food items and powders can obstruct x-ray images
When going through airport security, travellers are required to pass their belongings through X-ray machines. This includes food items and powders, which can obstruct the images produced by the X-ray. This obstruction can cause delays as security personnel may need to manually check the bags again. To minimise such delays, travellers can place food items and powders in their hold luggage instead of their hand luggage.
X-ray machines are used at airports to ensure the safety of travellers and staff by identifying hidden weapons, chemicals, and other items that are not approved for air travel. These machines emit low levels of radiation, which is carefully controlled to ensure the safety of those passing through security. The radiation dose typically received by objects scanned by an X-ray machine is 1 millirad or less, significantly lower than the average background radiation of 360 millirads per year.
While food items and powders can obstruct X-ray images, it is safe to pass these items through the machines. According to the FDA, food, drinks, medications, and other products passed through X-ray security scanning should not cause any harm or adverse effects. The small amount of radiation emitted by X-ray machines is not enough to cause any harmful effects, and the food we consume has likely been exposed to much higher levels of radiation during the food manufacturing process.
Additionally, the machines themselves are designed to keep radiation from escaping. Cabinet X-ray systems, for example, have thick walls, lead curtains at entry and exit points, and locks, warning lights, and labels to ensure the safety of users. The FDA's Center for Devices and Radiological Health (CDRH) also ensures that all X-ray systems are built and maintained to safely use radiation. Therefore, travellers can rest assured that their food items and powders will not be contaminated or affected by passing through airport X-ray machines.
While there are no known adverse effects from consuming food that has been X-rayed, some travellers may still prefer to minimise their exposure to radiation. In such cases, travellers can opt to consume food and drinks purchased after passing through security or pack their meals in checked luggage. Additionally, travellers should always follow the guidelines and instructions provided by airport security staff, as these are in place to ensure the safety and efficiency of the screening process.
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Electrical items may need to be screened separately
When going through airport security, it is important to remember that electrical items may need to be screened separately. This is to ensure that security officers can clearly see the items on the X-ray machine and to prevent prohibited items and other threats to transportation security from entering the airport. While smaller electrical items such as mobile phones and iPods can usually remain in your bag, larger items such as laptops, tablets, e-readers, and handheld game consoles should be placed in a separate tray for screening. This is in accordance with TSA guidelines, which state that personal electronic devices larger than a cell phone must be screened separately.
Additionally, some airports may have specific rules regarding the screening of electrical items. For example, at Manchester Airport, any electrical item larger than the size of A5 (20cm x 20cm) should be removed from hand luggage and screened separately. This includes items such as tablets, laptops, hair appliances, cameras, docking stations, chargers, speakers, and electric shavers. It is important to check with your specific airline and airport before travelling to understand their policies on screening electrical items.
Furthermore, certain types of batteries may have restrictions, so it is advisable to check with the CAA (UK Civil Aviation Authority) or your airline for clarification. It is also worth noting that medical equipment is typically permitted through security but will also need to be screened separately. Mobility aids, such as walking sticks, wheelchairs, and battery-powered mobility devices, are generally allowed in the cabin but will undergo separate screening as well.
To expedite the screening process, it is recommended to keep your bag organised and decluttered. This will facilitate a smoother and more efficient screening process, as TSA officers will not need to spend extra time inspecting a jam-packed bag. By following these guidelines and staying informed about the latest security measures, you can ensure a more seamless travel experience and contribute to the overall safety of air transportation.
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Frequently asked questions
Yes, you can use any type of clear, resealable plastic bag, such as a makeup bag or a freezer bag.
The bag should hold no more than a litre and measure approximately 20cm x 20cm.
All liquids, gels and aerosols must be under 100ml each and placed in the clear bag.
Liquids for essential medical purposes or baby food are exempt. You will need a prescription or doctor's note to prove these are required.
Liquids bought at the airport or on the plane, such as duty-free, can be taken through security if they are sealed inside a security bag with the receipt inside.











































