United Airlines Cabin Toiletries & Liquid Rules Explained: What Travellers Need to Know
Updated: Oct 5
Flying United Airlines from the UK and wondering whether you can take shampoo, deodorant, toothpaste, perfume or other toiletries in your cabin baggage?
United operates extensive transatlantic services between the UK and the United States, and many passengers continue from major US hubs such as Newark, Chicago and Washington Dulles to destinations throughout North America.
That makes the toiletries question slightly more complicated than it first appears. You need to consider the rules at your UK departure airport, the US Transportation Security Administration (TSA) rules for your journey home, and potentially the security arrangements at any airport where you connect.
The good news is that everyday toiletries are generally straightforward to carry once you know the rules.
Here’s what UK travellers need to know.
United Airlines Toiletries: Quick Answer
Everyday toiletries are generally permitted in United Airlines cabin baggage.
At most UK airports, ordinary liquids must still be in containers holding no more than 100ml, although some airports now permit containers up to two litres.
When flying from the United States, TSA’s 3-1-1 liquids rule generally limits liquids, gels and aerosols to containers of 3.4 US fluid ounces (100ml) or less.
Under the TSA rule, these containers must fit inside one clear, quart-size resealable bag per passenger.
Toothpaste, shampoo, conditioner, roll-on deodorant, aerosol deodorant, perfume, sun cream and many cosmetics count as liquids, gels or aerosols.
Essential medicines and certain baby products qualify for different treatment.
United’s standard carry-on size is 22 × 14 × 9 inches (56 × 35 × 23cm), including handles and wheels.
United also permits a personal item measuring up to 17 × 10 × 9 inches (43 × 25 × 22cm).
Most United fares include a standard carry-on, but Basic Economy has additional restrictions on some routes. Transatlantic Basic Economy currently retains a carry-on allowance.
If you’re connecting within the United States, consider the rules applying throughout your complete itinerary rather than only at your UK departure airport.
TSA currently describes its cabin liquids rule as 3.4 ounces or less per container, one clear quart-size bag and one bag per passenger. Transportation Security Administration
Flying United Airlines? Explore our range of travel-size toiletries, including deodorant, toothpaste, shampoo, conditioner and everyday essentials that are easy to pack in your cabin bag.
What Are the United Airlines Cabin Liquid Rules?
There are two sets of rules worth separating.
United Airlines determines what cabin baggage you can bring aboard the aircraft. Airport security determines which liquids can pass through the security checkpoint.
When departing from Britain, you therefore need to follow the rules at your UK departure airport.
At most UK airports, ordinary liquids still cannot pass through security in containers larger than 100ml. This applies even when a larger container is only partly full.
Some UK airports equipped with newer security scanners now allow containers holding up to two litres, and the requirement to use a separate transparent liquids bag also varies between airports. GOV.UK
When departing from the United States, TSA applies its 3-1-1 rule to ordinary liquids, gels and aerosols in carry-on baggage:
Containers must hold 3.4 US fluid ounces (100ml) or less.
They must fit inside one clear, quart-size plastic zip-top bag.
Each passenger is permitted one liquids bag. Transportation Security Administration
For a UK–USA return journey, toiletries in containers of 100ml or less therefore remain the straightforward option.
What Counts as a Liquid on a United Airlines Flight?
The definition of a liquid is considerably broader than simply drinks.
UK airport security specifically includes cosmetics and toiletries such as creams, lotions, oils, perfumes, mascara and lip gloss. Sprays, pastes, gels and contact lens solution are also included. GOV.UK
That means products likely to fall within the liquid restrictions include:
Shampoo
Conditioner
Shower gel
Toothpaste
Roll-on deodorant
Gel deodorant
Aerosol deodorant
Shaving foam
Hairspray
Moisturiser
Face cream
Sun cream
Perfume
Aftershave
Mascara
Lip gloss
Liquid foundation
Liquid concealer
Hair gel
Contact lens solution
One of the most common sources of confusion is toothpaste.
It may not look like a conventional liquid, but airport security treats it as a paste, so it falls within the liquid restrictions.
Does the 100ml Rule Still Apply When Flying United From the UK?
At most UK airports, yes — although the rules are no longer identical everywhere.
New security scanning technology means some UK airports allow passengers to take liquid containers holding up to two litres through security.
Other airports retain the familiar 100ml restriction.
Similarly, you may not need to remove liquids or place them inside a separate transparent bag at every UK airport. The government therefore advises passengers to check the rules at the airport they’re departing from, airports they’ll travel through and those used on the return journey. GOV.UK
For a United Airlines passenger, the return journey from America is particularly important.
TSA continues to apply its 3-1-1 rule to ordinary cabin liquids, gels and aerosols.
So even if your UK departure airport permits a larger bottle through security, you shouldn’t assume you’ll be able to bring the same bottle through a US airport on your journey home.
For a straightforward return trip, sticking to 100ml-or-smaller travel toiletries removes much of that uncertainty.
Flying to the USA: What Happens to Your Toiletries?
A United itinerary from the UK might look like:
London Heathrow → Newark/New York
London Heathrow → Chicago O’Hare
London Heathrow → Washington Dulles
Or you might continue from one of United’s US hubs to another destination.
For example:
London → Newark → Orlando
London → Chicago → Las Vegas
London → Washington → Denver
That makes it important to think about the whole journey, not just Heathrow security.
Once you are travelling from a US airport, TSA security rules become relevant.
For ordinary carry-on toiletries, TSA’s current 3-1-1 rule is simple: liquids, gels and aerosols should be in containers of no more than 3.4 ounces or 100ml, and all of them must fit in one quart-size clear plastic zip-top bag. Transportation Security Administration
Keeping your toiletries organised in 100ml-or-smaller containers therefore works particularly well for a UK–USA itinerary.
What About Your Return Journey From America?
This is one of the most important sections for UK travellers.
Suppose you fly from Heathrow to New York.
Your UK departure airport may have upgraded security scanners and potentially more generous liquid rules.
You enjoy your holiday, buy a large 250ml bottle of shampoo, a 200ml bottle of sun cream and perhaps some cosmetics.
When you arrive at a US airport for your flight home, TSA’s rules apply.
Ordinary cabin liquids must comply with the 3-1-1 rule.
That means the larger toiletries you bought during your holiday would normally need to go into checked baggage rather than your carry-on.
If you’re travelling hand-luggage-only, think about this before buying larger toiletries in America.
Travel minis can be useful for the outbound flight, but they also make the return journey considerably simpler.
What About Duty-Free Liquids?
Duty-free purchases can receive different treatment from ordinary cabin liquids, but connecting journeys require care.
UK rules allow qualifying duty-free liquids through security when they remain sealed inside the appropriate security bag and the receipt remains visible inside. You should not open that security bag before reaching your final destination. GOV.UK
If your journey involves another security checkpoint, however, the rules applying at that airport become important.
So if you buy a large bottle of perfume, aftershave or another liquid product at duty free:
Keep it in the sealed security bag.
Keep the receipt inside as instructed.
Do not open the bag during your journey.
Check the rules if you have a connecting flight.
Consider the rules that will apply on your return journey separately.
If you’re uncertain, tell the duty-free retailer where you are connecting and ask whether the purchase can travel through your complete itinerary.
Staying Connected in the USA
A trip to the United States also raises another practical question: how will you use your phone when you arrive?
UK mobile networks have different roaming policies for the USA, and charges depend on your provider and tariff.
A travel eSIM can provide an alternative way of accessing mobile data in the United States on a compatible phone.
Many compatible Dual SIM phones allow you to keep your UK SIM and normal telephone number active while using a separate travel eSIM for mobile data.
Keeping your UK SIM active does not automatically make calls, texts or roaming through that SIM free, so check your UK network’s charges before travelling.
If your United itinerary involves more than one country, check that your chosen travel eSIM provides coverage everywhere you need it.
Stay Connected When You Land
Flying to the United States? Explore travel eSIM options for your destination and check whether your phone supports eSIM before you leave the UK.
Related guide: Can You Use Two SIMs at the Same Time?
How Big Is a United Airlines Cabin Bag?
United’s standard carry-on dimensions are:
22 × 14 × 9 inches approximately 56 × 35 × 23cm
Those dimensions include the bag’s handles and wheels.
United’s personal-item dimensions are:
17 × 10 × 9 inches approximately 43 × 25 × 22cm
Your personal item needs to fit beneath the seat in front of you.
United does not currently publish a general numerical weight limit for its standard carry-on baggage; its published restrictions focus primarily on dimensions.
What About United Basic Economy?
United Basic Economy tickets can have additional cabin baggage restrictions, and the allowance may depend on the route and ticket purchased.
Because baggage entitlements can vary, check the cabin baggage allowance shown against your individual United booking before travelling rather than assuming that a full-size carry-on is included.
This is particularly important if your itinerary contains connecting flights or flights operated by another airline.
Choose the Right Cabin Luggage
Explore the Case cabin luggage collection and compare the external dimensions of your chosen case — including its wheels and handles — with United Airlines’ cabin baggage limits before buying.
Can You Take Toothpaste on United Airlines?
Yes.
Toothpaste is permitted in cabin baggage, but airport security treats it as a paste.
For a UK–USA journey, a tube holding 100ml or less is therefore the straightforward option.
When departing the United States, it needs to comply with TSA’s 3.4oz/100ml container limit for ordinary cabin liquids, gels and pastes.
A larger toothpaste tube doesn’t become compliant simply because most of the contents have already been used.
A travel-size tube avoids the problem entirely.
Can You Take Deodorant on United Airlines?
Yes.
Ordinary personal-care deodorant can generally travel in cabin baggage.
Roll-on and gel deodorants fall within the liquid restrictions. Spray deodorants are aerosols and are also treated as liquids for UK security purposes. GOV.UK
For a UK–USA return journey, a 50ml roll-on deodorant is particularly convenient because it sits comfortably inside the 100ml limit while taking relatively little room in your liquids bag.
Permitted aerosol deodorants should also comply with the applicable cabin liquid restrictions.
Can You Take Aerosols on United Airlines?
Certain personal-care aerosols can be carried, subject to the relevant security and dangerous-goods restrictions.
Examples can include:
Aerosol deodorant
Hairspray
Shaving foam
TSA’s 3-1-1 rule explicitly applies to liquids, gels and aerosols in carry-on baggage. Transportation Security Administration
That doesn’t mean every aerosol is permitted. Hazardous or highly flammable products can be subject to different restrictions.
For everyday cabin toiletries, use permitted personal-care aerosols within the applicable container limit and make sure caps or other protective measures prevent accidental discharge.
Can You Take Shampoo and Conditioner on United Airlines?
Yes.
Both shampoo and conditioner can travel in cabin baggage, but both count as liquids.
For a UK–USA return trip, containers of 100ml or less are the easiest choice.
If you’re visiting America for a longer holiday, consider whether you actually need to carry enough shampoo and conditioner for the entire trip.
You could:
Take travel-size products.
Use toiletries provided by your accommodation.
Buy larger products after arriving.
Pack larger bottles in checked baggage.
If you buy full-size products in America, remember that they will not normally meet TSA’s 3-1-1 cabin liquid rule for your flight home.
Can You Take Sun Cream on United Airlines?
Yes.
Sun cream is permitted, but creams, lotions, gels and sprays are treated as liquids.
For ordinary cabin baggage, 100ml-or-smaller containers are the simplest option for a UK–USA itinerary.
If you’re heading somewhere warm such as Florida, California or Hawaii, a single travel-size bottle may not be enough for the entire holiday.
You could therefore carry a small amount for your journey and immediate arrival, then buy additional sun protection after reaching your destination or pack larger supplies in checked baggage.
Can You Take Makeup on United Airlines?
Yes.
Everyday makeup can generally be carried in cabin baggage.
However, liquid, cream and gel cosmetics need to be treated as liquids.
These can include:
Mascara
Liquid foundation
Liquid concealer
Lip gloss
Cream blush
Liquid eyeliner
Gel cosmetics
UK security guidance specifically includes cosmetics such as mascara and lip gloss within its definition of liquids. GOV.UK
Solid and powder cosmetics are treated differently, although all items remain subject to normal security screening.
Remember that liquid makeup needs to share your available liquids-bag space with toothpaste, deodorant, shampoo and your other toiletries.
Can You Take Perfume and Aftershave on United Airlines?
Yes.
Perfume and aftershave can generally be carried in cabin baggage, subject to the liquid restrictions.
For ordinary cabin baggage, a bottle holding no more than 100ml is the straightforward option.
Smaller fragrance bottles or travel atomisers can be particularly useful because they occupy less room than a large glass bottle.
If you buy larger fragrances at duty free, keep them in the required sealed security packaging and check what happens if your journey involves another security checkpoint.
What About Medicines on United Airlines?
Essential medication is treated differently from ordinary toiletries.
When departing from the UK, essential liquid medicines can be carried in hand luggage in containers larger than 100ml.
If the medication is liquid and in a container larger than 100ml, UK government guidance says you’ll need evidence that it has been prescribed to you, such as a doctor’s letter or copy of your prescription. GOV.UK
Tablets and capsules and liquid medicines in containers of 100ml or less do not require that proof under the same UK security rule. GOV.UK
For an international journey:
Keep essential medicines accessible.
Carry them in their original packaging where practical.
Take relevant prescriptions or supporting documentation.
Check whether your medicine is subject to restrictions in the United States.
Check requirements for any other country on your itinerary.
Don’t place all essential medication in checked baggage in case the bag is delayed.
What About Baby Milk and Baby Food?
Baby milk and baby food can qualify for exemptions from the ordinary UK liquid restrictions.
UK rules allow passengers travelling with a baby to take enough baby food, baby milk and sterilised water for the journey, although security screening still applies. Breast milk can also be carried in individual containers of up to two litres. GOV.UK
Rules can differ in other countries.
If you’re travelling with a baby between Britain and America, check both your UK departure airport and current TSA requirements before travelling.
Can Toiletries Go in United Airlines Checked Baggage?
Yes.
Most everyday toiletries can be packed in checked baggage.
That can make considerably more sense for a longer US holiday when 100ml travel-size products won’t provide enough shampoo, conditioner, shower gel or sun cream for the whole trip.
Examples of everyday products that can normally travel in checked baggage include:
Shampoo
Conditioner
Shower gel
Moisturiser
Sun cream
Toothpaste
Perfume and aftershave
Aerosols and other regulated products can have additional quantity and dangerous-goods restrictions.
Small quantities of medicinal and toiletry articles have specific exceptions under US hazardous-material rules, but that doesn’t mean every aerosol or chemical product is acceptable. United Vacations
Secure lids carefully and place liquids inside a sealed toiletry bag to reduce the consequences of a leak.
A sensible long-haul strategy is to carry the toiletries you’ll need during the journey and immediately after arrival in your cabin bag and place larger supplies in checked baggage.
Best Toiletries for a United Airlines Long-Haul Flight
A transatlantic flight is long enough that a few carefully selected toiletries can make the journey considerably more comfortable.
Toothbrush and Toothpaste
Particularly useful on an overnight flight from the United States back to Britain.
A small travel tube takes very little room.
Deodorant
A compact 50ml roll-on is easy to pack and useful for freshening up before landing.
Moisturiser
Aircraft cabins can feel dry, so a small moisturiser may be worthwhile.
Lip Balm
Compact, light and useful during a long flight.
Face Wash
A travel-size face wash can be useful before landing after an overnight journey.
Sun Cream
Useful if you’re heading directly into a warm destination, although you may need considerably more once you arrive.
Shampoo and Conditioner
Think about whether you’ll genuinely use them during the journey.
If they’re only needed at your destination, your hotel may already provide them or you could purchase them after arrival.
United Airlines Toiletries for Different Types of Trips
New York City Break
Travel-size toiletries may be enough for the whole trip, particularly for a three- or four-night break.
A hand-luggage-only approach can work particularly well.
Florida Holiday
Sun cream is likely to be important, but a single 100ml bottle may not provide enough protection for an entire family holiday.
Consider larger supplies in checked baggage or buying more after arrival.
US Road Trip
If you’re travelling for several weeks, carry the small quantities you need for the flight and buy larger everyday toiletries after arriving.
Connecting Flight Within the USA
Keep essential toiletries and medication accessible in your cabin baggage rather than moving everything into checked luggage.
Business Travel
A permanently packed set of travel-size toiletries can make frequent transatlantic trips considerably easier.
Hand-Luggage-Only Travel
Be selective.
Your liquids need to fit within the applicable security arrangements, and carrying products you won’t actually use simply wastes cabin space.
Common United Airlines Toiletry Packing Mistakes
Assuming New UK Airport Scanners Apply in America
They don’t.
TSA continues to operate its 3-1-1 cabin liquid rule for ordinary liquids, gels and aerosols. Transportation Security Administration
Taking a Partly Empty Oversized Bottle
Where a 100ml container limit applies, the size of the container matters.
A 250ml bottle containing 50ml of shampoo is still a 250ml container.
Forgetting That Toothpaste Counts
Toothpaste is a paste and needs to be treated accordingly at airport security.
Buying Full-Size Toiletries Without Thinking About the Flight Home
A large bottle purchased in America may be perfectly useful during your holiday but unsuitable for your cabin baggage on the return flight.
Confusing United’s Baggage Rules With Airport Security Rules
United determines the size and number of bags you can bring aboard.
The airport security authority determines which liquids can pass through the checkpoint. They are separate issues.
Forgetting About the Personal Item Size
United’s published personal-item dimensions are smaller than its standard carry-on dimensions.
Check the actual external size of your bag rather than assuming any backpack will qualify.
Travel Minis or Decant Your Own?
Both can work.
Reusable Travel Bottles
Decanting lets you continue using your preferred products from home.
For a UK–USA journey, choose containers holding no more than 100ml, seal them carefully and label them clearly.
Branded Travel Minis
Ready-made travel sizes remove the need to decant.
They’re particularly convenient for products such as:
Toothpaste
Deodorant
Shampoo
Conditioner
Shower gel
Ready-Packed Travel Toiletry Kits
A ready-packed kit prioritises convenience.
Keeping a dedicated set of cabin-size toiletries means you don’t need to rebuild your wash bag every time you travel.
For frequent travellers, that can make preparing for a trip considerably quicker.
United Airlines Cabin Toiletries Checklist
Before leaving home:
Check the current liquid rules at your UK departure airport.
Check TSA requirements for your return flight from the USA.
Check any airports where you’ll connect.
Keep ordinary cabin toiletries in containers of 100ml or less for the simplest UK–USA journey.
Remember that toothpaste, creams, gels and sprays count.
Keep liquids organised and accessible for security.
Check that any aerosols are permitted personal-care products.
Keep essential medicines in your cabin baggage.
Carry supporting documentation for larger prescribed liquid medication where required.
Think about your return journey before buying full-size toiletries in America.
Keep duty-free liquids sealed as instructed.
Check your United fare’s cabin baggage entitlement.
Check your carry-on against United’s 22 × 14 × 9-inch maximum.
Check your personal item against United’s 17 × 10 × 9-inch maximum.
Remember that handles and wheels count towards the carry-on dimensions.
Pack only the toiletries you genuinely need.
United Airlines Cabin Toiletries & Liquid Rules FAQs
Can I Take Shampoo on United Airlines?
Yes. Shampoo can travel in cabin baggage. For a UK–USA return journey, a container holding no more than 100ml is the straightforward option.
Does Toothpaste Count as a Liquid on United Airlines?
Yes. Airport security treats toothpaste as a paste, so it falls within the liquid restrictions.
Can I Take Deodorant on United Airlines?
Yes. Ordinary roll-on, gel and permitted aerosol deodorants can generally be carried, subject to the relevant airport security and aerosol restrictions.
Can I Take Hairspray on United Airlines?
Permitted personal-care hairspray can generally travel subject to applicable liquid, aerosol and dangerous-goods restrictions. When departing the United States, cabin aerosols are covered by TSA’s 3-1-1 rule. Transportation Security Administration
Can I Take Perfume on United Airlines?
Yes. Perfume can generally travel in cabin baggage, subject to the liquid rules. A bottle holding no more than 100ml is the simplest option for a UK–USA return journey.
What Size Cabin Bag Can I Take on United Airlines?
United’s standard carry-on maximum is 22 × 14 × 9 inches (approximately 56 × 35 × 23cm), including handles and wheels. BagRule
What Size Personal Item Can I Take on United Airlines?
United’s published personal-item maximum is 17 × 10 × 9 inches (approximately 43 × 25 × 22cm), and it needs to fit under the seat in front of you. BagRule
Does United Have a Cabin Bag Weight Limit?
United does not currently publish a general numerical weight limit for its standard carry-on bag; the published allowance focuses on dimensions. Carry On Authority
Does United Basic Economy Include a Carry-On From the UK?
Cabin baggage entitlements can vary with the United fare and itinerary. Check the baggage allowance shown against your individual booking before travelling to confirm whether a full-size carry-on is included.
Does the 100ml Rule Apply When Flying Home From America?
For ordinary carry-on liquids, TSA currently applies its 3-1-1 rule: each container must hold no more than 3.4 US fluid ounces or 100ml, with the containers fitting into one clear quart-size bag per passenger. Transportation Security Administration
Can I Take Liquid Medicine Larger Than 100ml?
Essential liquid medication can qualify for exemptions. When departing the UK, prescribed liquid medicine in a container larger than 100ml requires supporting evidence such as a prescription or doctor’s letter. GOV.UK
More United Airlines Travel Advice
Continue planning your journey with our related guides:
Final Thoughts
United Airlines passengers can take everyday toiletries in cabin baggage, but the important thing for UK travellers is to distinguish between United’s baggage allowance and the airport security rules governing liquids.
At most UK airports, ordinary liquids remain restricted to containers of 100ml or less, although some airports now permit containers up to two litres. The rules vary by airport. GOV.UK
For the return journey from the United States, TSA currently applies its 3-1-1 rule, limiting ordinary carry-on liquids, gels and aerosols to containers of 3.4oz/100ml or less, fitting into one clear quart-size bag per passenger. Transportation Security Administration
For that reason, 100ml-or-smaller travel toiletries remain the simplest approach for a UK–USA return journey, even if your particular UK departure airport allows something larger.
United’s standard cabin baggage limits are also worth checking before you pack: the standard carry-on is up to 22 × 14 × 9 inches, while the personal item is up to 17 × 10 × 9 inches. Basic Economy rules vary by route, so always check the allowance shown against your actual booking. BagRule
Think about the complete journey — UK departure, US arrival and connections, your time away and the flight home — rather than treating the outbound security checkpoint as the only rule that matters.
That should make packing considerably simpler and reduce the chance of losing an oversized toiletry at security.
Information reviewed against current UK government, TSA and United Airlines baggage guidance, October 2026.
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