Madrid Airport Liquids Guide (AENA Regulations): What Counts as a Liquid?
A liquid at Madrid Airport includes traditional liquids, aerosols, gels, and pastes; all must be in individual containers of 100ml or less and fit completely into a single 1-liter transparent, resealable plastic bag per passenger.
The security checkpoint is the place where expensive perfumes, beloved skincare routines, and water bottles are lost every single day. Despite constant advancements in aviation technology, the regulations surrounding liquids remain the primary cause of delays at the security screening areas in Barajas. While some new 3D scanners are slowly being tested in parts of Terminal 4, the vast majority of the security lines in 2026 still strictly enforce the classic rules. Understanding exactly what counts as a liquid—and what doesn’t—is the best way to breeze through the metal detectors in under 30 seconds without having to throw away your favorite products.
1. The Universal 100-1-1 Rule at Security Checkpoints
To pass through standard airport security without having your items confiscated, you must adhere to the 100-1-1 rule: 100ml maximum per bottle, placed in one 1-liter bag, with a limit of one bag per traveler.
Until the new generation of scanners is fully implemented across every single lane at Madrid-Barajas, security agents apply zero tolerance to these regulations. When preparing your carry-on luggage, you must strictly follow this internationally recognized standard:
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100ml maximum per container: This is the most common trap. The rule applies to the capacity of the container, not the contents. If you bring a 200ml bottle of sunscreen that is almost empty, it will still be thrown in the trash.
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1-liter total capacity: The transparent plastic bag where you store your items must not exceed 20×20 centimeters (approximately one liter in volume), and it must be able to close completely without forcing the zip.
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1 bag per passenger: You cannot divide your liquids into two different plastic bags, even if they are small. Everything must fit into one single bag.
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2. The Gray Area: Is This Actually a Liquid?
Many items that you consider solid food or daily makeup—like peanut butter, soft cheeses, mascara, and roll-on deodorants—are actually classified as liquids or pastes by airport scanners and must go in the clear bag.
This is the part where most travelers get confused. The scanner does not differentiate between a high-end cosmetic and a jar of spreadable cheese; to the machine, density is what matters. Here is the definitive list of common items that cause doubts at the security lines:
| Item / Product | Is it considered a Liquid? | Does it go in the Clear Bag? |
|---|---|---|
| Mascara / Eyeliner | YES (It is a paste/gel) | YES |
| Roll-on Deodorant | YES | YES |
| Lipstick / Chapstick | NO (It is solid) | NO |
| Spreadable Cheese / Peanut Butter | YES (Careful with food souvenirs) | YES (Max 100g) |
| Contact Lenses in Cases | YES (Due to the saline liquid) | YES |
Expert Tip from frequent flyers: The easiest way to avoid the 1-liter bag limit is to substitute your gels for solid alternatives. Switch to solid shampoo bars, stick deodorants, and toothpaste tablets. This frees up an enormous amount of space in your security bag for items you truly cannot replace.
3. Exceptions: What You CAN Bring (Over 100ml)
Exceptions to the 100ml rule are strictly limited to necessary liquid medications with a prescription, baby food required for the flight, and sealed Duty-Free purchases.
AENA (the Spanish airport authority) understands that certain travelers have essential needs that bypass the standard regulations. However, you cannot simply leave these oversized liquids inside your suitcase; you must take them out and explicitly present them to the security agent before the tray goes through the scanner.
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Essential Medications: Liquid medicines, syrups, or insulin needed during the trip are allowed in containers larger than 100ml. However, you must carry the official medical prescription or a doctor’s note to justify it.
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Baby Food and Milk: If you are traveling with a baby or toddler, you can bring purees, breast milk, or sterilized water needed for the journey. Security agents may ask you to open the containers to test them on a special scanner.
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Duty-Free Purchases: Any bottles of alcohol or large perfumes bought in the airport shops after passing security can be taken on board, provided they remain sealed in the official security bag (STEB) with the receipt clearly visible.
Frequently Asked Questions About Liquids at Madrid Airport
Can I bring an empty water bottle through the security checkpoint?
Yes, you can bring any empty plastic or metal reusable bottle through the X-ray scanner without issues, and then refill it for free at the drinking water fountains located in the boarding areas of Terminals T1, T2, and T4.
Does hairspray or shaving cream count towards my liquid allowance?
Yes, aerosols are classified as liquids and are also highly flammable; therefore, any aerosol can must be 100ml or less to pass through security, and larger cans will be confiscated immediately.
Can I bring a large bottle of contact lens solution if I really need it?
No, standard contact lens solution does not qualify as an exempt medical necessity, so you must either bring travel-sized bottles (under 100ml) or pack the large bottle securely in your checked luggage.