TSA 311 Rule: How Much Liquid Can You Bring in 2026

How does the 3-1-1 liquids limit work in practice at 2026 checkpoints?

When you roll up to a 2026 TSA checkpoint, the 3-1-1 rule is very much alive and kicking, relying on that standardized quart-sized clear plastic bag with a strict 946-millimeter capacity limit per passenger that you have to keep in a dedicated bin during the CT scan. Here's what I mean: each individual liquid container must hold 3.4 fluid ounces (100 milliliters) or less, and while you can combine multiple small containers into that one bag, stacking them is a bad move because it blocks the CT imaging and invites a manual inspection. At high-traffic checkpoints during peak travel times, compliance rates hit around 87 percent, with most violations coming from oversized souvenirs or partially filled travel-sized bottles that mess with the density limit per container rather than the total bag volume.

TSA PreCheck members aren't magically exempt from the 3-1-1 liquids rule, but they do get a slight speed bump since they can keep the quart bag in a laptop sleeve while screening, provided it's not overloaded and stays clear for the CT rotation. The TSA’s 2025 operational data shows liquids-related stoppages occur in roughly 2 percent of screened bags, usually because travelers confuse container size with the total bag limit, and when the CT system flags a liquid density anomaly, it triggers swab testing in about 0.4 percent of carry-on screenings at major hubs. Unlike some places that might experiment with dynamic liquid screening based on real-time chemical analysis, the U.S. has not rolled that out yet, so at over 400 airports using computed tomography scanners, the quart bag protocol is the final word for carry-on liquids from checkpoint right through to the gate.

International arrivals into the United States really hammer this home because you have to repack any liquids into compliant containers before clearing customs, as the 3-1-1 rule applies from the checkpoint through the gate area regardless of your departure terminal. Looking at the operational data, there's a clear trade-off between the old-school approach of strict enforcement and emerging tech, but for now, the TSA has stuck with the 3-1-1 quart bag as the simplest, most enforceable standard for carry-on liquids nationwide as of 2026. So if you're navigating these checkpoints, you're better off playing it straight and keeping your liquids organized in that one clear bag to avoid the dreaded swab test and keep your momentum going through security without a hitch.

Which common items are allowed and which are banned under the liquid rules?

When you're rolling up to that TSA checkpoint, the liquid rules can feel kind of confusing, but let's clear that up because getting this wrong means you're either stuck dumping half your toiletries or getting flagged for a swab test, so here’s what you actually need to know about what's allowed and what's banned. Think of the quart-sized clear plastic bag as your liquid command center, because every single container inside it must hold 3.4 fluid ounces (100 milliliters) or less, and this is where people mess up by grabbing a giant souvenir water bottle that looks tiny on the shelf but violates the density limit per container rather than the total bag volume, which sits at a strict 946-millimeter capacity limit per passenger. Hair gels and liquid latex are treated as liquids, so your standard travel-sized tube of hair gel is only allowed if it squeezes into that quart bag, while your travel-sized toothpaste tube, despite being sold in slightly bigger sizes, also has to play by the 3.4 fl oz (100 ml) rule or get confiscated. Lipsticks and solid stick deodorants escape the liquid rules entirely because they are classified as solids, meaning you can carry full-size sticks without volume restrictions, and the same goes for stick foundations and mascaras if you keep them out of the quart bag. Medications like liquid prescription insulin are exempt from the per-container limit, but you have to declare them at the checkpoint and may still face extra screening, while baby formula and breast milk get special treatment too, with limits based on what you need for the trip and requiring removal from the quart bag for screening.

Now, spray cans like hairspray and sunscreen count as liquids and must each be under 3.4 fl oz (100 ml), with all of them fitting together in the single quart-sized clear bag, but pressurized containers like canned air for cleaning keyboards or silicone spray are banned from carry-on luggage entirely because they can act like a projectile or explode under changing cabin pressure, regardless of whether they look like a liquid. You might not realize it, but condiments like ketchup and mustard that you grab at a stadium are usually banned from carry-on because they exceed that 3.4 fl oz (100 ml) ceiling unless they’re in compliant travel sizes, and the same goes for alcoholic beverages, which are capped at 3.4 fl oz (100 ml) per container in your carry-on and can’t exceed 70 percent alcohol by volume, so that full-sized mini-bar bottle of wine has to go in your checked bag. Stick to the one quart bag, keep every container under the limit, and remember that oversized souvenirs or partially filled travel-sized bottles are the top reasons for liquids-related stoppages, with around 2 percent of screened bags facing delays at major hubs, so you’re better off playing it straight to avoid a swab test and keep your momentum through security without a hitch.

Also worth reading: Top 7 Airline Water Bottle Policies How Much Liquid You Can Really Bring Through Airport Security in 2024 · TSA's 2024 Makeup Guidelines What You Can and Can't Bring on Your Flight · Gobble Til You Wobble: TSA-Approved Thanksgiving Foods You Can Bring on a Flight, Plus Tips from Celebrity Chef on Travel-Friendly Holiday Dishes · TSA's 3-1-1 Rule Navigating Liquid Food Restrictions on US Flights

Sources: wikipedia, intercaribbean, itilite, airline-baggage-fees, thepointsguy