TSA rules limit liquids in carry-on bags to containers of 3.4 ounces (100 ml) or smaller , all fitting into one clear, quart-sized plastic bag per passenger—this is the classic 3-1-1 rule (3.4 oz max per item, 1 quart bag, 1 bag per person).

Checked bags have no liquid size restrictions , so pack larger bottles there if possible.

Core Rules Breakdown

These guidelines from the TSA apply to U.S. flights as of March 2026, stemming from post-9/11 security measures to curb liquid explosive risks.

  • Carry-On Liquids Limit : Each bottle (shampoo, lotion, drink, etc.) ≤ 3.4 oz (100 ml) —even if partially full, the container capacity matters, not the contents.
  • Bag Requirement : Everything goes in one 1-quart (≈1L) clear Ziploc-style bag , easily screened at checkpoints.
  • Applies To : Liquids, gels, aerosols, creams, pastes—like toothpaste or sunscreen.
  • No Changes Everywhere : Despite CT scanner rollouts at some U.S. airports in 2026 easing pre-check limits, most still enforce 3-1-1 —check your airport!

"Containers larger than this size are not allowed, regardless of how much liquid is actually inside them."

Exceptions That Save the Day

Real travelers share stories of smooth sails with these loopholes—always declare them upfront.

  1. Medications : Larger amounts OK (liquid or pill); inform TSA, possibly screened separately.
  1. Baby Essentials : Formula, breast milk, food—reasonable quantities beyond 3.4 oz, with notice.
  1. Duty-Free Alcohol : Sealed bags from airports often exempt post-security.
  1. Empty Bottles : Bring reusable ones through security, fill post-checkpoint.
  1. TSA PreCheck : Same rules, but bags stay unremoved from carry-on.

International Flights Twist

U.S. TSA is strict, but rules vary abroad —EU/UK mirror 100 ml max, while others differ. For connections, follow the strictest (often origin).

Aspect| Carry-On| Checked Bags
---|---|---
Max Bottle Size| 3.4 oz (100 ml) 13| Unlimited 1
Bag Needed?| Yes, 1 quart clear 1| No 1
2026 Airport Note| CT scanners may relax at select spots 5| Unaffected 1

Traveler Tips from Forums & Trends

Online chatter (Reddit/Twitter 2025-2026) raves about TSA-approved 100 ml squeeze bottles for easy packing—decant big ones pre-flight. One viral story: A family lost $50 sunscreen at security, learned to buy post-check. Speculation? Full 2026 scanner adoption might end 3-1-1 everywhere, but don't bank on it yet.

Pack smart: Photograph your bag pre-line for disputes. TL;DR Bottom : Stick to 100 ml bottles in a quart bag for carry-on; checked bags are free game. Rules steady in 2026 sans full scanner shift.

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