The TSA liquids limit allows up to 3.4 oz (100 mL) per container in a single quart bag, with specific exceptions for medical items and baby needs.
Flying with shampoos, creams, and travel sprays doesn’t need to be a guessing game. This guide explains the carry-on limits in plain language, shows what actually fits in a quart bag, and lays out the exceptions that let you bring larger amounts when you need them. You’ll also see packing tactics that speed you through the checkpoint without losing a thing to the bin.
Liquids Rule 100 mL: What Counts And What Doesn’t
The carry-on limit applies to anything that can pour, spread, or smear. That includes liquids, gels, aerosols, creams, pastes, and similar textures. Each container must be 3.4 ounces (100 milliliters) or less, and all containers have to fit inside one clear, zip-top quart bag. One bag per traveler. If a single bottle is bigger than 3.4 ounces, even if it’s half full, it goes in checked baggage or gets left behind.
Items that behave like solids once frozen still count as liquids when slushy or partly melted. Peanut butter, soft cheese, and creamy dips are treated the same as lotion or toothpaste. Pack them in travel sizes or place them in checked bags.
Quick Reference: Carry-On And Checked Status
| Item | Carry-On | Checked Bag |
|---|---|---|
| Toiletries (shampoo, lotion, toothpaste) | Up to 3.4 oz each, all in one quart bag | Any size, cap secured |
| Aerosols (hair spray, deodorant) | Travel size only in quart bag | Usually allowed; follow size and cap rules |
| Foods that spread (peanut butter, soft cheese) | Travel size in quart bag | Any size, sealed |
| Water or drinks | Only empty bottle through security | Any size |
| Hand sanitizer | Travel size unless a posted temporary allowance applies | Any size within airline hazmat limits |
| Medically necessary liquids | Reasonable quantities allowed; declare for screening | Any size |
| Infant milk and baby food | Reasonable quantities allowed; declare for screening | Any size |
How To Pack Liquids For A Smooth Checkpoint
Start with a real quart bag. Sandwich bags are smaller. A true one-quart, clear, resealable bag gives you the space budget to fit nine or ten mini bottles if you choose slim shapes. Keep the bag at the top of your carry-on so it’s easy to pull out when an officer asks.
Decant bulky toiletries into 1–3 ounce travel bottles. Choose leak-resistant caps and label them so shampoo doesn’t become face wash by accident. Keep pressurized cans capped to prevent accidental sprays. If you use solid versions of shampoo, deodorant, or perfume, those skip the liquid limit entirely and free up space for items you can’t swap.
What Actually Fits In A Quart Bag
A mix that works for many travelers: a mini toothpaste, a small sunscreen, face moisturizer, cleanser, hair product, and two other small bottles. Flat, flexible pouches waste less space than round bottles. Group similar shapes together so the bag lies flat in the tray.
Exceptions: Bigger Containers You Can Bring
Two broad categories sit outside the travel-size rule: medically necessary items and supplies for infants and toddlers. Bring them in reasonable quantities for the trip, remove them from your bag, and tell the officer at the start of screening. Extra screening may include swabbing the outside of the containers or a test strip over the opening.
Medically necessary items include liquid medications, contact lens solution, nutritional drinks used for treatment, and similar needs. Infant and toddler items include formula, breast milk, toddler drinks, and purées. Ice packs and gel packs that chill these items may travel when frozen; if slushy, an officer may test them.
For the current wording straight from the agency, see the liquids rule page and the infant feeding exemption.
Alcohol, Sprays, And Flammables
Travel-size alcohol-based products in carry-ons must sit inside the quart bag. Larger spray cans and alcohol-heavy items belong in checked luggage, and many airlines apply volume caps for safety. Keep lids or caps in place. If you must pack a lighter or matches, check the airline’s conditions and the hazardous materials page before you go.
Common Edge Cases That Trip People Up
Makeup and skincare: Mascara, liquid eyeliner, setting spray, foundation, and nail polish count as liquids. Lip balm in a stick is fine outside the bag; a gloss tube goes in the bag. Makeup remover wipes aren’t liquids.
Food gifts: Jam jars, maple syrup, honey bears, salsa, and hummus count as liquids. Ship them or check them. Solid candy bars and cookies can ride in your backpack without any size worry.
Protein powders and drink mixes: Dry powders can go in any bag. If you carry a big tub, officers may ask you to move a small amount into a separate bin for scanning.
Frozen items: If completely frozen solid, they can pass the checkpoint. If the container shows any liquid or slush, the travel-size limit applies.
Refillable water bottles: Bring them empty through screening and fill them on the other side. Many airports post water stations near the gates.
Carry-On Liquids Packing Plan (Step By Step)
1) Sort By Texture
Put every pourable, spreadable, squeezable item in one place. That includes gels, sprays, and creams.
2) Measure Containers
Accept only containers marked 3.4 ounces (100 mL) or below for your carry-on bag. Anything larger goes in checked baggage.
3) Fill One Quart Bag
Pick a clear, resealable quart bag and fit your travel bottles inside. Aim for flat, low-profile containers to save space.
4) Separate Exceptions
Pull out medical liquids and baby supplies. Keep them in a small tote for fast declaration at the start of screening.
5) Stage For The Tray
Set the quart bag and exceptions at the top of your personal item. When you reach the belt, place them in the tray without digging.
Rules Recap With Practical Scenarios
Let’s apply the limits to real packing choices. The chart below shows common items and the right move for each case. Use it to run a quick audit before you zip your bag.
| Scenario | Carry-On Action | Why It Works |
|---|---|---|
| 6 oz sunscreen bottle | Check it or buy travel size | Container exceeds 3.4 oz limit |
| 2.7 oz toothpaste tube | Place in quart bag | Under the per-container limit |
| Peanut butter 12 oz jar | Check or ship | Counts as a spreadable liquid |
| Empty 24 oz water bottle | Carry empty, fill after | Empty containers are allowed |
| 4 oz prescription liquid | Declare as medical | Reasonable quantities allowed |
| Frozen gel pack for milk | Bring; officer may test | Permitted for cooling needs |
| Hair spray 1.4 oz | Place in quart bag | Pressurized but travel size |
| Hand cream in a tin | Outside the bag if solid | Solid sticks and balms are fine |
| Baby purée pouches 6 oz | Declare as infant food | Exempt from travel-size rule |
Checked Bags: Size Freedom With A Few Safeguards
Placing full-size toiletries in checked luggage saves space in your quart bag and reduces what you handle at screening. Tape flip caps, tighten pump heads, and bundle bottles inside a leak pouch or a double zip bag. Pack aerosols upright, keep caps on, and avoid dented cans. Airlines cap total amounts for flammable toiletries; if you carry many large sprays, review your carrier’s limits before you pack.
Drinks and sauces travel well in checked bags. Wrap glass and keep liquids away from edges where baggage handling can crush corners. If you plan to bring back local honey or jam, put a spare zip bag and cushioning inside your suitcase on the outbound leg.
When Rules Change Or Get Temporary Tweaks
Occasionally the agency posts a short-term allowance or an extra screening step. You’ll see it called out on the liquids rule page and inside the item-by-item list. Before you head out, search the official site for your exact item and compare the wording to your packing list.
Common Misreads
Half-full isn’t compliant: A 6-ounce bottle that’s only one third full still exceeds the carry-on container limit. Size is based on labeled capacity, not the amount inside.
“Medical” means a treatment need: Sports drinks or regular snacks don’t qualify. Liquid prescriptions, contact lens solution in larger bottles, and nutrition used for treatment can exceed the travel-size threshold when declared.
“Reasonable quantity” isn’t unlimited: Pack what you’ll use during the trip. Officers may ask questions when volumes look far beyond that need.
Traveler Tips That Save Time
Pick The Right Containers
Choose square or flat-sided bottles. They pack tighter than round ones and help you fit more in the bag. Skip pump tops in carry-ons; screw caps leak less under air pressure.
Decant Only What You’ll Use
Fill travel bottles to the amount you’ll need for the days away. Partial bottles still count by container size, but packing smaller containers keeps you within limits and keeps weight down.
Use Solid Alternatives When Practical
Solid shampoo, conditioner bars, and deodorant sticks live outside the liquid bag. They save space and won’t spill.
Stage Your Bag At Home
Do a quick dry run: place the quart bag, laptop, and exceptions where you can reach them without digging. This simple prep shortens your time at the belt.
Bottom Line: Pack Small Liquids, Declare Exceptions, Check The Rest
Carry only travel-size containers in one quart bag. Pull out larger medical items and infant supplies and tell the officer right away. Everything else rides in checked luggage. With a clear plan and a tidy quart bag at the top of your carry-on, you’ll move through screening with fewer delays and fewer surprises.