Carry-On Toiletry Kit: TSA 3-1-1 Packing Guide
The quart bag, the bottles, and the few bathroom pieces that survive security and still feel like home in a hotel shower.
You can book the right hotel and still feel slightly undone on day one if your carry-on toiletry kit is a loose pile of hotel minis and drugstore impulse buys. The TSA 3-1-1 rule is not complicated, but the bag, the bottle sizes, and the few pieces that do not belong in the quart pouch are worth deciding once.
This is a focused packing guide for carry-on toiletries – not a full suitcase list. For the broader first-trip edit (bottle, fan, power bank, cubes), start with our First-Trip Travel Essentials hub. For budget add-ons under fifty dollars, the travel essentials checklist goes wider.
The 60-second version: one quart-size clear bag of 3.4-ounce bottles, plus solid soap, a bamboo toothbrush in a ventilated case, and toothpaste split between the quart bag and the dry side of your kit.
Prices and availability are current on Amazon.
The 3-1-1 rule (without the lecture)
3 – each liquid container must be 3.4 ounces (100 ml) or smaller.
1 – all liquid containers go in one quart-size clear bag (roughly 7 x 8 inches).
1 – one bag per passenger, presented separately at security.
Toothpaste, liquid sunscreen, face wash, conditioner, gel deodorant, and spray anything all count. Solid bar soap, solid deodorant sticks, and a dry toothbrush do not – that is why a bar-and-case combo is one of the highest-leverage upgrades in a carry-on toiletry kit.
If a bottle is over 3.4 ounces, it flies in checked luggage or stays home. Decanting at home beats buying a wall of single-use minis that never quite match what you use daily.
The bag and bottles (foundation)
Most friction at security is not the rule itself – it is a quart bag that will not zip, bottles that leak in the overhead bin, or containers without readable labels. A purpose-built TSA-approved toiletry bag with refillable bottles solves all three: clear quart pouch, leak-resistant caps, and sizes already within limits.
Pack the liquids you actually use – cleanser, moisturizer, shampoo, conditioner if you need it – and leave headroom in the zip. Officers need to see the contents; overstuffed bags get opened and repacked at the tray.
Clear, leak-proof, reusable.
Soap that travels (outside the quart bag)
Hotel bar soap is fine for one night. For a long weekend or back-to-back cities, a French milled bar travels better than a soft soap that turns to mush in a plastic dish. Milled bars are dense, dry quickly, and last – the kind of piece you buy once and drop into every kit.
Pair the bar with a ventilated soap case so it dries between uses instead of gluing itself to a ziplock. That case rides in your toiletry kit or a side pocket, not inside the quart bag, because solids stay separate from the 3-1-1 liquids.
Real soap, no mess.
Dry storage on the road.
Tooth care (brush, case, paste)
Toothpaste is liquid to TSA – it lives in the quart bag. The toothbrush does not, but a wet brush in a closed case breeds exactly the smell you think it will. Pack a bamboo toothbrush you are fine leaving in the kit (many brands sell multi-packs so the travel brush is not your only one at home) and a breathable travel case so the bristles dry between uses.
Bamboo handles are light, dry fast, and skip the cheap hotel plastics that feel wrong by day two. Slide the brush into the ventilated case outside the quart bag with your soap – same dry side of the kit, same screening logic as solids.
For toothpaste, a compact tube that still feels like your home routine beats the chalky hotel envelope. Whitening pastes with gentler ingredients are easier on gums when travel schedules throw off sleep and coffee intake.
Light brush, dry case.
Keep the brush dry.
Toothpaste in the quart bag.
Mistakes we see (and what we skip)
Overpacking liquids. You do not need full-size duplicates of everything for a four-day trip. Three to five bottles in the quart bag, refilled from home, covers most carry-on toiletry runs.
Putting the soap bar in the quart bag. It wastes space and confuses screening. Solids stay out; liquids stay in.
Skipping labels. A strip of tape with “SPF” or “cleanser” on each bottle speeds repacking after security and at the hotel.
What we usually skip: disposable razors bought at the airport (buy one at home in a blade case), perfume in glass bottles over 3.4 ounces, and ten single-use hotel steals you will never finish. If you need gear beyond the bathroom – charger, cubes, fan – that is the first-trip essentials hub, not this list.
Then plan the trip
Toiletries packed, pick the city layer next. Each first-trip guide covers neighborhoods, booking timing, and what to reserve before you fly:
Browse verified stays in Charleston, Nashville, Chicago, or Orlando when you are ready to book.
Shop the edit
Everything above in one place – tap any piece to check the current price.
Prices and availability are current on Amazon.
The bottom line
A carry-on toiletry kit is not glamorous. It is the difference between clearing security once and repacking a wet quart bag in your socks, between using your own soap and relying on whatever the hotel left that day. Buy the kit once, refill the bottles every trip, and let the bathroom stop being the part you figure out at midnight.
Frequently Asked Questions
Answered with data from our research.
What is the TSA 3-1-1 rule for toiletries?
For US airport security, liquids, gels, creams, pastes, and aerosols in carry-on luggage must be in containers of 3.4 ounces (100 milliliters) or less. All containers must fit in one quart-size clear bag, one bag per passenger, removed from your carry-on for screening. Larger bottles belong in checked luggage or stay home.
Do solid soap bars count as liquids for TSA?
Solid bar soap is not treated as a liquid under the 3-1-1 rule, so it can travel outside the quart bag. Solid deodorant sticks, powder makeup, and solid shampoo bars are generally treated the same way. Anything that melts, spreads, or sprays still counts as a liquid.
What should be in a carry-on toiletry bag?
At minimum: toothbrush and toothpaste, any liquids in 3.4-ounce bottles inside a quart bag, and your daily basics (face wash, moisturizer, sunscreen if it is liquid). Add a bar soap in a ventilated case if you want to skip hotel minis, and keep everything in a hanging or flat kit so it unpacks in one motion at the hotel.
Are travel-size toiletries worth buying?
Pre-filled minis are convenient for one trip but expensive per ounce and often not your usual brands. A reusable TSA-approved bottle kit pays for itself after two flights. Decant what you already use at home into labeled 3-ounce bottles and refill the same kit every trip.
Related Guides
More travel intel for planning your trip.