You can take up to 3.4 ounces (100 ml) of liquid per container in your carry-on on a plane. This follows the TSA's longstanding 3-1-1 rule, which remains unchanged as of February 2026 across all U.S. airlines.

Core Rule Breakdown

The TSA 3-1-1 liquids rule strictly limits carry-on liquids, gels, creams, and aerosols to:

  • 3.4 ounces (100 ml) or smaller per individual container.
  • All containers must fit into 1 clear, quart-sized (about 1 liter) zip-top bag.
  • 1 bag per passenger , which must be easily removable for security screening.

This federal regulation applies uniformly—no U.S. airline like American, Delta, United, Southwest, or JetBlue offers exceptions beyond TSA allowances.

Why the Limit Exists

Implemented after 2006 security threats involving liquid explosives, the rule prioritizes passenger safety while minimizing screening delays. It prevents bulk hazardous materials in the cabin, where checked bags face fewer restrictions.

Common Exceptions

Certain essentials bypass the 3.4-ounce cap if declared at security:

  • Medications (liquids, gels, or aerosols in reasonable quantities).
  • Baby formula, breast milk, or food for infants/toddlers.
  • Contact lens solution or medical devices.

Always inform TSA officers upfront; they may test or inspect these items separately.

Category| Carry-On Limit| Checked Bag Limit
---|---|---
Liquids (e.g., shampoo, lotion)| 3.4 oz per container in 1 quart bag 1| No limit, but pack securely 6
Duty-free alcohol/perfume| Allowed if in STEB (Secure Tamper-Evident Bag) from airport shops 3| Unlimited if sealed
Exceptions (meds, baby items)| Over 3.4 oz if declared 1| No limit

International Variations

  • UK/EU : Similar 100 ml limit in 1-liter bags.
  • Some airports (e.g., select European ones) have piloted looser rules with new scanners, but U.S. flights enforce TSA standards outbound.

Travelers should verify destination rules, as returning flights may differ.

Packing Tips for Smooth Travel

Follow these steps to avoid confiscations:

  1. Use travel-sized bottles (decanters available at stores).
  2. Double-bag leaky items with plastic wrap under caps.
  1. Place the quart bag in an easy-access pocket.
  2. For longer trips, buy toiletries post-security or ship ahead.

Pro Tip : Security lines move faster if you're prepared—fumbling liquids is a top delay cause.

TL;DR at Bottom

Max 3.4 oz per liquid in one quart bag for carry-on. Exceptions for meds/baby needs; unlimited in checked bags. Rules steady in 2026—no major changes reported.

Information gathered from public forums or data available on the internet and portrayed here.