Can You Bring Mouthwash on a Plane?
Category: Toiletries & Personal Care
Yes, with limits — you can bring mouthwash in carry-on bags provided you follow security limits. Carry-on: ≤ 3.4 oz (100 ml) in the quart bag.
Verified against published 2026 TSA (United States) & CATSA (Canada) security screening databases.
On this page · 9 sections
⚖️ Why This Rule Exists: International 3-1-1 Liquid Security Rules & Container Geometry
Containers with a marked capacity of 100 ml (3.4 oz) or less that fit within a single clear, resealable 1-quart (1-liter) plastic bag are permitted through screening because small volumes can be rapidly inspected and present limited hazard potential.
Rules by security authority
United States — TSA
Carry-on
Restricted
Yes — bottles of 3.4 oz (100 ml) or less inside your liquids bag; larger bottles go in checked luggage.
Checked bag
Yes
Yes — no special limits beyond normal packing; bag the cap against leaks.
Flying internationally? Security follows the country you depart from — the authority above applies at your departure airport. Customs at arrival is separate.
🔍 Security Checkpoint & X-Ray Screening Advice
Place your clear 1-quart bag in the screening bin outside your luggage in 2D X-ray lanes. In 3D CT scanner lanes, keep it inside your bag unless instructed otherwise by the screening officer.
Learn more about scanner differences and traveler rights in our Airport Security Screening Guide →
⚠️ Common Traveler Mistake to Avoid
How to Avoid It: Consolidate all toiletries into one quart bag per traveler or transition to solid alternatives (shampoo bars, solid deodorant).
💧 3-1-1 liquids rule checker
One quart-size (≈1 L) bag per passenger; every container must be 3.4 oz (100 ml) or less.
Fit is approximate — container shape decides real-world packing. Medically necessary liquids and infant food are exempt: declare them. Packing a whole bag? Plan it container by container →
How to Pack Mouthwash for a Flight
Mouthwash on a plane — FAQs
Can you bring Mouthwash in a carry-on?
Yes — bottles of 3.4 oz (100 ml) or less inside your liquids bag; larger bottles go in checked luggage.
Can you pack Mouthwash in checked luggage?
Yes — no special limits beyond normal packing; bag the cap against leaks.
Why are there rules for mouthwash on a plane?
Containers with a marked capacity of 100 ml (3.4 oz) or less that fit within a single clear, resealable 1-quart (1-liter) plastic bag are permitted through screening because small volumes can be rapidly inspected and present limited hazard potential.
Last verified:
Verified against official sources. Rules change — for high-stakes items, confirm with your airline and the screening authority. Our verification method →