TSA Quart Size Bag Dimensions: The Complete 2026 Guide
TSA quart size bag dimensions are simpler than most luggage specs, but they still confuse people. The rule comes from the Transportation Security Administration, not from bag makers. TSA says you get one quart-size clear bag for liquids in carry-on luggage. Check current guidance on the TSA site before you fly, because rules change. The bag itself is not a TSA-certified product. No such certification exists. You just need a clear pouch around one quart in volume.
Most travelers picture a sandwich bag. That's the right mental model. The official rule is about capacity, not exact width, height, or depth. TSA names the volume and the clarity. The rest is up to you. A disposable zip bag works. So does a reusable PVC pouch with a zipper.
Buyers sourcing private-label toiletry bags care about this page for a different reason. A quart-size clear pouch is a high-volume travel accessory. It sells year-round. The dimensions you pick affect the user's experience at security and inside a backpack. Get the shape wrong and the bag bulges awkwardly. Get it right and it slides into a front pocket.
What the TSA 3-1-1 Liquids Rule Actually Says
TSA's 3-1-1 rule is a liquids limit for carry-on bags. The name is a memory aid. Three stands for the container size in ounces. One stands for the single quart-size clear bag. The final one stands for one bag per passenger. TSA states this rule on its own website. Verify it there before any trip, because airports and officers apply it with some discretion.
The rule covers liquids, aerosols, gels, creams, and pastes. Each container must hold no more than 3.4 ounces, which is 100 milliliters. That's the container capacity, not the amount left inside. A half-empty 6-ounce tube does not qualify. The container size is what matters.
All qualifying containers must fit inside one clear quart-size bag. The bag needs to close. If it doesn't close, the officer may ask you to remove items. The bag is screened separately in many airports. You'll place it in a bin. That's why a wide opening and a sturdy zipper matter more than people expect.
What a Quart Means in Volume
A quart is a quarter of a gallon. In metric terms, that's just under one liter. The exact volume is about 946 milliliters. TSA does not measure your bag with a graduated cylinder at the checkpoint. The quart size is a guide, not a hard dimensional limit.
This is where the confusion starts. A quart describes volume. Bags of very different shapes can all hold one quart. A tall skinny pouch and a short wide pouch can both qualify. The TSA rule does not specify length, width, or depth. It specifies capacity and clarity. That gives manufacturers room to design.
Say you have a pouch that measures 8 inches by 7 inches. It holds about a quart when flat. Another pouch measures 7.5 by 6.5 inches with a wider gusset. It also holds about a quart. Both work. The shape changes how the bag sits in a suitcase, not whether it passes.
Why Quart Bag Dimensions Vary
No single quart bag dimension exists. That's the honest answer. The volume stays the same, but the panel size, gusset depth, and corner shape can all change. A flat two-panel pouch needs a larger footprint to reach one quart. A boxed pouch with a bottom gusset reaches the same volume with a smaller footprint.
Material stiffness also changes the usable shape. A soft polyethylene bag flattens and spreads. A stiffer PVC or TPU pouch holds its shape and may need more depth. The zipper type matters too. A wide U-shaped zipper makes packing easier, but it can reduce the effective flat area.
Imagine a buyer ordering 800 units in three colors for a pharmacy chain. They want the pouch to fit a standard carry-on front pocket. We'd start with the pocket dimensions, then adjust the gusset until the volume lands near one quart. The final spec might be 7.5 by 6.5 by 2 inches. That's a real design conversation, not a catalog pick.
Common Clear Bag Formats: A Dimensions Comparison
Travelers encounter several clear bag shapes. Each has a different footprint and depth. The table below compares the formats you'll see most often. The measurements are typical ranges, not a promise. Your bag may differ.
| Format | Typical flat size | Depth when packed | Best use |
|---|---|---|---|
| Flat zip pouch | 7, 8 in wide, 7, 8 in tall | Under 1 in | Disposable, light packers |
| Boxed pouch with gusset | 7, 7.5 in wide, 5.5, 6.5 in tall | 1.5, 2.5 in | Reusable, frequent travelers |
| Stand-up pouch | 6.5, 7 in wide, 8, 9 in tall | 2, 3 in | Countertop use, easy access |
| Hanging toiletry bag | 8, 9 in wide, 6, 7 in tall | 2, 3 in | Hotel use, hook storage |
A flat zip pouch is the cheapest and lightest. It's also the most likely to split at the seam. A boxed pouch costs more but lasts longer and stands on a counter. The hanging format adds a hook, which needs reinforcement because the full load concentrates at one attachment point.
Reusable Coated Pouch vs. Disposable Zip Bag
The TSA rule doesn't care which bag you use. You should. A disposable zip bag is single-use in practice. The closure weakens after a few openings. The film punctures easily. A reusable pouch with a coated fabric or PVC body behaves differently.
Durability is the obvious difference. A coated polyester or PVC pouch resists tearing. The seams are stitched or welded, not just pressed. A welded seam provides better leak containment than an ordinary stitched seam. That matters when a shampoo bottle opens at 35,000 feet.
Cleanability follows the same logic. A smooth coated or film-based inner surface can be wiped clean with limited moisture. That's the definition from the bag industry manual. A disposable bag gets thrown away. A reusable pouch gets wiped and reused. Over a year of monthly trips, the cost per use flips in favor of the reusable pouch, even though the upfront price is higher.
Seam construction is where cheap pouches fail. A stitched bag may still use a removable waterproof insert when full seam sealing is unnecessary. But for a quart-size clear pouch, a welded or taped seam is the better call. It delays liquid escape. It is not guaranteed to remain liquid-tight under pressure, so don't overpromise. Say it resists leaks, not that it's leakproof, unless you've tested it under stated conditions.
Carry-On Liquid Rules Outside the US
The quart-size bag is a US rule. Other regions use similar limits with different names and details. The European Union applies a 100-milliliter container limit with a clear resealable bag. Check the European Commission's aviation security page before you fly. The bag size may differ from a US quart.
The United Kingdom follows a similar 100-milliliter rule. The UK Civil Aviation Authority publishes current guidance. Some UK airports have introduced new scanners that change the liquid limits. Do not assume the old rule applies. Verify locally.
Canada uses a 100-milliliter container limit and asks passengers to place liquids in a clear, resealable bag. Transport Canada sets the rule. Australia and New Zealand have comparable limits through their aviation security agencies. Always check the regulator's site for the country you're departing from. The rules are not identical.
FAQ: Exceptions Travelers Ask About
These are the questions that come up at the checkpoint and in our inbox. Every answer names the regulator. Every answer tells you to verify.
Can I bring medication in a separate bag?
TSA allows medically necessary liquids in reasonable quantities outside the quart-size bag. Declare them at the checkpoint. Officers may screen them separately. Check the TSA website for the current list of what counts as medically necessary.
What about breast milk or formula?
TSA permits breast milk, formula, and baby food in quantities greater than 3.4 ounces. You do not need to fit them in the quart-size bag. Declare them. They may be screened separately. Verify the current TSA guidance before traveling with a baby.
Does duty-free liquid count?
Duty-free liquids purchased after security may be allowed in a sealed tamper-evident bag. Keep the receipt. The rules depend on your destination and any connecting flights. Check TSA and your airline's guidance. The sealed bag is not the same as your quart-size bag.
Can I use a non-clear bag if it's quart size?
No. TSA requires the bag to be clear. The officer needs to see the contents without opening the bag. A mesh bag also fails the clarity test in most cases. Use a transparent film or clear coated fabric.
Sourcing Private-Label Quart-Size Clear Pouches
If you're a brand owner, this is a product worth stocking. The search volume for quart size bag dimensions is high because travelers need replacements. A well-made pouch with your logo sells at airport shops, pharmacies, and online. The MOQ is reasonable. We start at 500 pieces for a custom clear toiletry bag.
The material choice matters. Transparent PVC is cheap and stiff. TPU film is softer and more flexible. Both can be welded. A polyester body with a clear film window is another option. The zipper should be a wide-tooth plastic zipper that survives repeated opening. A hanging hook adds value, but it needs a reinforcement patch.
You'll want to specify the flat dimensions, the gusset depth, and the volume. Then decide on printing. A small logo on the front panel is standard. Full-panel printing on clear film is possible but reduces clarity. The TSA rule cares about clarity, so keep the print small.
Our factory makes these pouches in Yiwu. We run BSCI-certified production and can supply a coated PVC or TPU pouch with welded seams. The lead time for a custom clear toiletry bag is 7 to 15 days after sample approval. Samples take 1 to 10 days. That's the honest range. It depends on the spec.
See the TSA quart size toiletry bag we already produce. It's a good starting point for your own line. Or browse the full product range to see other formats. If you need a larger run, the bulk makeup bags page explains our MOQ structure. For general questions about how we work, the about page covers the factory. And the contact page is the fastest way to reach us with a spec.
Frequently Asked Questions
What are the exact TSA quart size bag dimensions?
There is no exact dimension. TSA specifies a one-quart clear bag, roughly 946 milliliters. The shape and measurements are up to you, as long as the bag is clear, closes, and holds about a quart.
Can I bring two quart-size bags?
TSA's 3-1-1 rule allows one quart-size bag per passenger. A second bag may be allowed for medically necessary liquids or baby food, but those are declared separately. Check current TSA guidance before you fly.
Does a reusable PVC pouch pass TSA screening?
Yes, if it is clear and about one quart in volume. TSA does not require a specific brand or material. A durable PVC or TPU pouch with a zipper works as well as a disposable zip bag.
What is the metric equivalent of a quart-size bag?
One US quart is about 946 milliliters, just under one liter. Many international travelers use a one-liter clear bag, which is slightly larger. Check the liquid bag rule for the country you are departing from.