TSA Carry-On Liquid Rules: The 3-1-1 Guide for Travelers
TSA carry-on liquid rules are easier to follow when you separate everyday toiletries from medical and child-related exceptions. This guide explains the 3-1-1 rule, what counts as a liquid or gel, how to pack the bag, and what to expect at the security checkpoint.
Quick answer
For most liquids, gels, aerosols, creams, and pastes in carry-on baggage, use containers of 3.4 ounces (100 milliliters) or less. Put them in one clear, quart-size, zip-top bag, with one bag per passenger. Larger containers normally belong in checked baggage.
TSA officers make the final decision at the checkpoint. Medical liquids, breast milk, formula, juice, and some child-related items may be allowed in larger quantities, but you should remove them from your bag and tell the officer before screening.
TSA liquid rules at a glance
This table brings the key tsa liquid rules at a glance details together so you can compare the most important information quickly.
Use it as a practical planning guide, then confirm the current airport or airline instructions before travel.
| Question or situation | Helpful answer |
|---|---|
| Standard toiletry | 3.4 oz / 100 mL or less per container in one quart-size bag. |
| Shampoo, lotion, toothpaste | Usually follows the 3-1-1 rule. |
| Liquid medicine | May be allowed over 3.4 oz when medically necessary. |
| Breast milk or formula | Allowed in reasonable quantities beyond 3.4 oz. |
| Frozen gel or ice pack | Allowed when used to cool medically necessary items. |
| Large bottle of water | Not allowed through the checkpoint full. |
What counts as a liquid for TSA?
The rule covers more than drinks. Gels, aerosols, creams, pastes, liquid makeup, toothpaste, shampoo, conditioner, sunscreen, mouthwash, shaving gel, and similar products can all be treated as liquids. If the item can spill, spread, spray, or pour, pack it as a liquid unless TSA guidance says an exception applies.
Solid foods and solid toiletries are often easier to carry, but combination products can still be screened. A lipstick, solid deodorant, powder makeup, or bar soap may be treated differently from a liquid or gel version. When unsure, check the item before packing rather than waiting until the checkpoint.
How to pack your 3-1-1 liquids bag
Use small containers that show the volume clearly. Place all standard liquids in one transparent quart-size bag and keep the bag near the top of your carry-on. Do not hide bottles in clothing or spread them across several bags.
Large containers that are partly empty can still exceed the limit because the container size matters. Move full-size shampoo, drinks, sauces, and lotions to checked baggage when permitted, or buy them after security.
- Separate liquids, gels, aerosols, creams, and pastes before packing.
- Use containers no larger than 3.4 ounces or 100 milliliters.
- Place standard items in one clear quart-size bag.
- Keep medically necessary liquids and baby items separate.
- Remove the liquids bag and declare exceptions at screening.
TSA liquid packing scenarios
This table brings the key tsa liquid packing scenarios details together so you can compare the most important information quickly.
Use it as a practical planning guide, then confirm the current airport or airline instructions before travel.
| Scenario | What to do | Why it matters |
|---|---|---|
| Carry-on shampoo | Use a 3.4-ounce or smaller bottle in the quart bag. | A larger bottle may be refused even if partly empty. |
| Prescription liquid medicine | Pack what you need and declare it to the officer. | Medical liquids can be screened separately. |
| Baby formula or breast milk | Carry reasonable quantities and tell TSA before screening. | These items do not have to fit in the quart bag. |
| Food with sauce or gel | Check whether the item behaves like a liquid or gel. | TSA decides whether the item can pass. |
| Duty-free liquid | Keep it sealed with the required receipt and packaging. | Opening the package can affect screening eligibility. |
| Empty water bottle | Carry it empty through security. | Refill it after the checkpoint. |
What happens at the TSA checkpoint?
Place the liquids bag where it can be removed quickly, unless the lane instructions tell you to leave it packed. Tell the officer about medical liquids, breast milk, formula, ice packs, or other exceptions before the bag enters the scanner.
Additional screening does not automatically mean the item is prohibited. TSA may inspect the container, swab the outside, or ask questions about its purpose. Follow the officer’s directions and avoid arguing about an item after the final decision is made.
- Pack only one standard quart bag per passenger.
- Label medicine and keep prescriptions available.
- Use leakproof travel bottles inside the bag.
- Put large drinks and full-size toiletries in checked baggage.
- Check airline baggage rules separately from TSA screening rules.
Special items and screening judgment
Some items are not simply approved or refused by container size. TSA may inspect powders, food, gels, tools, and unusual equipment more closely. Pack items so they can be removed without unpacking your entire bag, and keep medical documentation available when relevant.
The 3-1-1 bag is a travel aid, not a guarantee that every product will pass. If an item has a sharp, flammable, or hazardous feature, check the separate prohibited-items guidance and the airline’s baggage rules before arriving.
Frequently Asked Questions
These FAQs explain the TSA carry-on liquid rules that cause the most confusion, including medicines, baby items, food, and container sizes.
TSA officers make the final screening decision, so allow extra time when carrying exceptions.
Most carry-on liquids, gels, aerosols, creams, and pastes must be in containers of 3.4 ounces or 100 milliliters or less, packed in one quart-size clear bag, with one bag per passenger.
Toothpaste is treated as a gel or paste and normally follows the 3-1-1 rule.
Medically necessary liquids may be allowed in larger quantities. Tell the TSA officer before screening and remove them for separate inspection.
Yes. Breast milk and formula can be carried in reasonable quantities beyond 3.4 ounces, but they should be removed and declared for separate screening.
A full bottle normally cannot pass the checkpoint. Carry it empty and refill it after security.
Some foods are allowed, but liquids, gels, and sauces may be subject to the 3-1-1 rule. TSA makes the final decision.
TSA rules and screening procedures can change. Check current TSA guidance and follow the instructions of the officer at your checkpoint.