For 3.4-ounce travel containers, each must be 100 mL or less and fit in one clear quart-size bag; medical and baby items are screened separately.
Flying with toiletries shouldn’t feel like a riddle. The liquid rule is simple once you break it down: containers up to 3.4 ounces (100 milliliters) go in a single, clear, resealable quart bag, one bag per traveler. Bigger bottles ride in checked baggage. Exceptions exist for health needs and infant care, but they involve a short chat with the officer at the belt.
What The 3-1-1 Rule Means In Practice
The shorthand “3-1-1” translates to three parts: 3.4-ounce containers, one quart bag, and one bag per person. It applies to liquids, gels, creams, pastes, and aerosols you carry through the checkpoint. Think shampoo, sunscreen, toothpaste, contact lens solution, hair spray, and similar items. If the bottle says more than 100 mL, place it in checked baggage, even if it’s half full.
Quick Reference: Common Toiletries And Limits
Use the table below to map typical items to the right bag. It keeps your carry-on light and your screening quick.
| Item | Carry-On Limit | Checked Bag |
|---|---|---|
| Shampoo/Conditioner | Up to 3.4 oz each in quart bag | No size cap for non-hazardous liquids |
| Toothpaste | Tube up to 3.4 oz in quart bag | Any size |
| Sunscreen/Lotion | Up to 3.4 oz in quart bag | Any size |
| Aerosol Deodorant/Hair Spray* | Up to 3.4 oz in quart bag | Permitted within FAA size totals |
| Makeup Liquids (foundation, mascara) | Each up to 3.4 oz in quart bag | Any size |
| Contact Lens Solution | Up to 3.4 oz in quart bag | Any size |
| Hand Sanitizer | Up to 3.4 oz in quart bag | Any size |
| Shaving Cream/Gel | Up to 3.4 oz in quart bag | Permitted |
| Solid Toiletries (bar soap, stick deodorant) | Not subject to the liquid limit | Permitted |
| Powders (makeup, protein mix) | 12 oz+/350 mL may need extra screening | Preferred if container is large |
*Aerosols must be toiletry/medically necessary and follow airline/FAA quantity caps for checked bags.
3.4-Ounce Toiletry Bottles: Rules That Matter
Those palm-size bottles are the sweet spot for the checkpoint. To pass smoothly, make sure each container actually states 3.4 oz (or 100 mL) or less on the label. Place all of them in a single zip-top quart bag and remove that bag from your carry-on for screening when asked. A loose bottle rolling in your backpack slows the line and may be pulled for manual inspection.
Liquids, Gels, Creams, Pastes, And Sprays
If it can pour, smear, pump, squeeze, spray, or spread, treat it as a liquid. That includes peanut butter, yogurt cups, and travel coffee creamers. Pack food spreads bigger than 3.4 oz in checked baggage to avoid a hand search that delays you and everyone behind you.
What About Powders?
Powders aren’t part of the liquid limit, but containers around 12 ounces (350 mL) or larger often trigger extra screening. Keep big tubs in checked baggage when possible to keep your checkpoint routine fast and simple.
Exceptions For Health And Infant Needs
Medical liquids, breast milk, formula, and juice for young children aren’t bound by the 3.4-ounce container cap. You can bring reasonable quantities through the checkpoint. Tell the officer you’re carrying them, remove them from your bag, and expect a brief test or visual check. Clear containers and separate packing help.
Medications, Ice Packs, And Supplies
Liquid prescription meds, gel packs for temperature control, and related supplies are allowed in amounts above the 100 mL mark. Bring the medication label or a doctor’s name if available, keep items accessible, and plan a few extra minutes for screening.
Feeding Babies And Toddlers
Formula, expressed milk, and toddler drinks can exceed 3.4 oz. Keep them in bottles or pouches you can open if asked. A small cooler with gel packs is fine. Officers may swab containers or the outside surfaces; you won’t be asked to taste the contents.
Packing Strategy That Saves Time
Success at the belt starts at the sink when you’re filling bottles. Resist the urge to squeeze shampoo from a big bottle into an unlabeled jar. If the size marking is missing or hard to read, it invites questions. Labeled travel bottles with tight caps and a proper quart bag keep things tidy.
Set Up Your Bag
- Dedicate one quart bag to liquids and keep it near the top of your carry-on.
- Use leak-proof bottles and test the caps before you fly.
- Switch to solids where it makes sense: bar shampoo, solid deodorant, toothpaste tablets.
- Split your kit: daily items in carry-on; larger backups in checked baggage.
Know When To Check
Big sunscreen for a beach trip? Full-size hairspray? Large tubs of protein mix? Skip the extra steps at security and check them. It saves repacking at the belt and keeps your carry-on light.
Food And Drinks In Carry-On
Drinks bought before security can’t go through the checkpoint. Bring an empty bottle and fill it airside or on the plane. Liquid or spreadable foods—soups, dips, nut butters—follow the 3.4-ounce container cap in carry-on. Solid snacks like crackers, chips, and whole fruit are fine.
Handling Duty-Free Purchases
Buying liquids after security? Keep the receipt and leave items sealed in the tamper-evident bag if you have a connection. Another checkpoint later could still screen the item, and opening the bag early can complicate things.
When Aerosols Are Allowed
Personal-care aerosols such as hair spray and shaving cream are treated like other liquids in carry-on: 3.4 oz or less and placed in your quart bag. Larger toiletry aerosols can go in checked baggage, subject to airline and FAA totals for flammables. Non-toiletry sprays like paint or insecticide are a no-go in the cabin and often barred entirely.
Smart Workarounds For Longer Trips
Refill small bottles from big ones at home. Stash a spare quart bag in your suitcase in case the first one tears. For family travel, give each person their own quart bag to spread out the load. Many hotels stock common toiletries, so call ahead and pack lighter. For sun-heavy trips, buy a large sunscreen at your destination and share it.
Step-By-Step Packing Plan
Use this plan the night before you fly. It prevents last-minute rummaging and awkward repacks at the belt.
| Step | Where It Goes | Tip |
|---|---|---|
| Group liquids and gels | Quart bag, top of carry-on | Cap-tight check; add tape for leak-prone lids |
| Move big bottles | Checked baggage | Place in side pocket inside a zip bag |
| Pack meds and baby items | Separate pouch in carry-on | Keep labels visible; declare at screening |
| Set aside powders | Carry-on if small; checked if large | Large tubs slow screening; pack in checked |
| Prep empty water bottle | Carry-on side sleeve | Fill after security |
| Stage the quart bag | Exterior pocket | Easy to pull out at the belt |
Edge Cases Travelers Ask About
Deodorant Types
Sticks and crystals ride outside the quart bag. Sprays and gels follow the liquid cap and go in the bag.
Contact Lenses And Solutions
Daily disposables and cases are fine. Solution follows the 3.4-ounce limit for carry-on. Larger bottles belong in checked baggage unless they are medically needed in transit.
Makeup And Skincare
Liquid foundation, serum, toner, and setting spray all count toward the quart bag. Powder compacts and blush pans don’t. Face wipes are treated as solids and save space.
Soups, Sauces, And Spreads
Pack small travel cups if you need them on the flight. Bigger jars of salsa, pasta sauce, and peanut butter should be checked or purchased at your destination.
What To Do At The Checkpoint
- Place the quart bag in a bin when asked. Keep laptops, large electronics, and shoes separate per local setup.
- Tell the officer about medical liquids and baby items before screening starts. Keep them together for a quick test.
- If something is flagged, stay calm and answer questions. Officers see this every day and will guide you through.
Authoritative Rules You Can Trust
For the full text of the liquid policy, see the 3-1-1 liquids rule. For infant and medical exemptions, review TSA’s pages on breast milk, formula, and juice exceptions. These pages mirror the procedures officers use at the belt.
Quick Myths Versus Facts
“Half-Full Big Bottles Are Fine.”
No. Screeners check labeled capacity, not the current fill line. A 6-ounce bottle that’s half empty still exceeds the cap for carry-on.
“All Aerosols Are Banned.”
No. Personal-care sprays are allowed within the 3.4-ounce limit in carry-on and can be checked in larger sizes when they meet airline and FAA rules.
“Powders Follow The Same Rule.”
No. Powders don’t have a 3.4-ounce cap, but containers around 12 ounces or more may receive extra screening and can be refused if they can’t be cleared.
Make A Simple Packing List
- Quart bag with labeled 3.4-ounce bottles
- Solid bar soap and stick deodorant
- Small sanitizer, lip balm, travel toothpaste
- Empty water bottle
- Checked bag stash for full-size liquids
Why These Rules Exist
The liquid limits grew out of security threats involving liquid explosives. The goal is to keep screening fast while lowering risk. Sticking to travel sizes and using a single quart bag lets scanners see what’s inside your carry-on, reduces alarms, and moves the line along.
Pack Light, Breeze Through
Pick labeled travel bottles, build a neat quart bag, and keep health and infant items separate to declare. With that setup, you’ll fly through screening and reach the gate with everything you need—and none of the hassle.