At Heathrow, carry-on liquids must be in containers up to 100 mL, inside one clear 1-liter bag shown at security.
Pack with the checks in mind and your time in the queue shrinks. This guide explains the 100-millilitre cabin limit at Heathrow, what counts as a liquid, and ways to pack toiletries, drinks, medicines, and duty-free without hiccups.
Quick Rules Most Travelers Miss
The headline rule is simple: each liquid container in hand baggage must be 100 mL or smaller. Bigger containers stay in checked luggage, even if they’re half full. All small containers go into a single transparent, resealable bag that holds up to one litre, about 20 × 20 cm. One bag per person. Show it at the search point.
Liquids include more than shampoos. Many semi-solid or gel items fall under the same rule: creams, pastes, roll-ons, sprays, foams, yogurts, soups, and anything spreadable. If it pours, smears, pumps, or sprays, treat it as liquid for security.
What Counts As Liquid At Heathrow
The list below keeps cabin packing neat. Use travel-size bottles where you can and shift the rest into hold luggage.
| Item Type | Carry-On (≤100 mL) | Pack In Hold |
|---|---|---|
| Water, juice, soft drinks | Containers up to 100 mL only | Any larger bottles |
| Shampoo, conditioner, body wash | Decant into 100 mL bottles | Full-size bottles |
| Face cream, lotions, sunscreens | Travel tubes ≤100 mL | Full-size pumps and tubs |
| Makeup: liquid foundation, mascara | Items ≤100 mL or small tubes | Jumbo sizes |
| Aerosols: deodorant, hairspray | ≤100 mL per can (check airline) | Large cans |
| Gels & pastes: toothpaste, hair gel | Travel tubes ≤100 mL | Family sizes |
| Food spreads: peanut butter, jam | Small pots ≤100 mL | Regular jars |
| Yogurt, custard, soup | Small sealed cups ≤100 mL | Larger tubs or bowls |
| Contact lens solution | ≤100 mL in liquids bag | Larger bottles |
| Duty-free liquids (transfers) | Sealed in STEB with receipt | Repack if seal broken |
Close Variant: Heathrow Carry-On Liquid Limit Explained
Move faster by packing for the inspection flow. Before you reach the trays, pull out the clear bag and place it beside your coat and phone. Keep laptops and large electronics ready too, unless the lane uses CT scanners and staff say to leave them in your bag.
Container Size Beats Volume Inside
Screeners check the size printed on the bottle, not how much is left. A 150 mL tube that’s half empty still breaches the cabin rule. Switch to a 100 mL travel bottle or move the item to checked luggage.
One Liter Means Capacity, Not Bag Size
The clear bag must close flat. If the zip strains, you have too much. Pick a 20 × 20 cm bag and load smaller bottles first.
Baby Milk, Liquid Foods, And Care Items
You may take baby formula, sterilized water, purees, and breast milk in amounts needed for the journey. These do not have to fit the 100 mL limit, but screening may include extra checks. Keep them separate and tell the officer as you reach the belt.
Prescription Medicines And Medical Liquids
Liquid medication is allowed in quantities needed for travel. Keep it in original packaging when you can. A copy of the prescription or a doctor’s note helps if a bottle is over 100 mL.
Duty-Free Purchases On Connections
Buying spirits or perfume during a connection? Keep the items sealed inside a tamper-evident bag with the receipt visible. If the seal is broken before you pass security again, the item may be taken or moved to hold bags.
Rules Source And Current Status
Heathrow’s page on hand baggage confirms the 100 mL cap and the one-liter clear bag rule, while GOV.UK explains the same limits and notes that some airports with CT scanners may allow larger containers. Check both pages before you travel: Heathrow hand baggage and liquids and GOV.UK liquids guidance and timings.
Packing Strategy That Saves Time
Think in layers. Toiletries you’ll use on the flight go in the liquids bag at the top of your cabin case. Spares ride in the checked suitcase. Keep dry items outside the liquids bag: bar soap, solid deodorant, makeup sticks, and powder compacts move through faster and don’t count toward the one-liter capacity.
Swap Liquids For Solids Where Practical
Solid shampoo, conditioner bars, and toothpaste tablets help you stay within the limit. They’re compact and don’t spill. Switching a few bulky bottles to solid forms leaves room for sunscreen and lens cleaner.
Decant Wisely And Label Bottles
Use reusable 100 mL silicone or PET bottles. Label them with a marker or pre-printed stickers. Leak-proof caps and a small funnel keep your kit tidy.
Edge Cases That Trip People Up
Aerosols. Small personal-care cans up to 100 mL can ride in your liquids bag if they meet airline limits. Large spray bottles go in hold luggage.
Contact lenses. Lenses are dry and fine anywhere. Solution over 100 mL goes in hold luggage; a small bottle fits in the liquids bag.
Protein shakes and soups. Premixed drinks count as liquids. Powder is fine; mix after security or buy airside.
Makeup. Powders and sticks are fine outside the liquids bag. Cream shadows, gloss, and mascara sit inside the clear bag.
Fresh foods. Solid snacks are fine. Anything spreadable or runny belongs in small pots or in hold luggage.
Sample Packing Lists For A Weekend Flight
Here are real-world kits that meet the cabin limit for a two-to-three-night stay.
| Scenario | Liquids Bag (≤1 L) | Dry/Outside The Bag |
|---|---|---|
| Business trip | 30 mL face wash, 30 mL moisturizer, 50 mL sunscreen, 50 mL toothpaste, 50 mL hair product, 10 mL perfume | Stick deodorant, razor, powder compact |
| City break | 50 mL body wash, 50 mL shampoo, 50 mL conditioner, 50 mL sunscreen, 30 mL face cream, 10 mL fragrance | Bar soap, makeup sticks, brush |
| Family visit | 2 × 50 mL kids’ wash, 50 mL lotion, 50 mL toothpaste, 50 mL sanitizer | Solid shampoo bars, wipes |
How To Handle Oversize Liquids At The Queue
Reach the belt and spot a 200 mL tube in your tote? You have a few options. First, ask if the airline desk can add a late check-in bag; fees may apply. Next, look for a mail-and-fly service to post the item home. If neither works, you’ll need to discard it before screening. Do a last pocket check as you join the line.
What Happens During Extra Screening
Officers may swab the outside of the bag or run a second pass through the scanner. Stay near the bench so you can answer quick questions. Keep receipts handy for duty-free items in sealed bags.
Simple Checklist Before You Leave Home
Build your liquids bag. Choose small bottles up to 100 mL each, under one litre total, and label them. Move full-size items to hold. Wrap caps and stand bottles upright. Keep proof for exceptions. Bring prescriptions or letters for medical items and baby feeds. Stage your items. Put the clear bag and laptop on top so you can unload in one motion.
Why Heathrow Still Uses The 100 mL Cap
The rule stems from UK security policy shaped after past plots involving liquid explosives. Airports are rolling out computed-tomography scanners that create 3D images and can relax some limits. Implementation across big hubs takes time. Until upgrades are fully in place across the operation, the safest approach for travelers is to stick to 100 mL containers and the single one-liter bag.
Key Takeaways For A Stress-Free Trip
Pack small containers in a single clear one-liter bag. Keep powders and solids outside the bag. Carry medical and baby items in the amounts you need, with proof ready. Leave big bottles in checked baggage. Seal duty-free in a tamper-evident bag and keep the receipt. Follow these steps and screening at Heathrow runs smoothly, even at peak times.