How to Pack a Carry-On Bag | Smart, Compliant Packing

For most airlines, a carry-on can measure up to 45 linear inches (height plus width plus depth), and your liquids must each be under 3.4 ounces.

For the full breakdown, see our best Carry-On Bag For A Woman guide.

Packing a carry-on well means balancing two demands: clearing security and fitting everything into the overhead bin or under the seat. The rules are clear, but travelers trip over the same details. Start with size compliance, then liquid rules, then a packing order that keeps the bag light and essentials accessible.

Know The Carry-On Size Rules

That’s the general ceiling, but not a guarantee every airline accepts it. Each carrier publishes its own limits; many cap carry-ons around 22 x 14 x 9 inches, while budget carriers often have smaller allowances. Check your airline’s current dimensions online before packing—a bag that fits one carrier may get checked at the gate on another. When in doubt, size down.

Even a compliant bag won’t work if it’s so packed that a flight attendant can’t shut the bin.

Pack Liquids The TSA Way

The TSA liquid rule applies to everyone at U.S. checkpoints. Each passenger may carry travel-size containers of 3.4 ounces or 100 milliliters—the limit per container, not per bag. All liquids, gels, and aerosols must fit into one quart-size bag, which must go in its own bin during screening. That single clear bag is your only allowance, so make it count:

• Decant full-size toiletries into TSA-approved travel bottles of 3.4 ounces or less.
• Keep every container in that one quart-size bag, including aerosols like dry shampoo and hairspray.
• Place the bag on top of your items so you can grab it fast at the checkpoint.

Some items are exempt: medications, baby formula, and breast milk can exceed 3.4 ounces and don’t need to fit in the quart-size bag. Declare them at the checkpoint and keep them accessible. Small bottles of contact lens solution are also handled separately.

Pack The Bag In The Right Order

How you arrange contents determines how easy the trip is. Heavy items go at the bottom, near the wheels or back of the bag, so weight stays low. Soft items like sweaters can wrap around electronics or sit on top to cushion them. A simple sequence works:

1. Layer the bottom with shoes (heel-to-toe, soles wrapped in plastic) and other dense items.
2. Fill the middle with rolled clothing—rolling saves space and reduces wrinkles.
3. Place electronics flat against the back panel, where they’re protected and easy to reach.
4. Top it off with the quart-size liquids bag and any in-flight items, like a jacket or book.

Rolled shirts and pants compress into a fraction of folded space and fit into gaps around bulkier items. Pack only what you need—the lighter the bag, the easier it is to lift into the bin and the less likely it is to tip over.

What Stays Out Of Security

Beyond liquids, a few items belong in checked baggage. The FAA’s pack-safe chart lists common household items and where they can travel; anything flammable, pressurized beyond small sizes, or sharp is restricted or banned. That includes lighters, large batteries, and knives over a certain length.

One practical note: TSA rules are consistent, but airline size limits vary. A quick check of your airline’s website before packing saves you from a gate-side conversation and a surprise fee. Pack the same disciplined way every time—compliant liquids, proper size, smart order—and you’ll move through security without drama.

FAQs

What counts as a quart-size bag?

It doesn’t need to be a specific brand, but it must seal, hold all your liquids, and be transparent so screeners can see contents. Zipper-top plastic bags work fine.

Can I bring a full-size bottle of contact lens solution?

Yes, but declare it separately. Solution over 3.4 ounces is treated like medication and exempt from the quart-size rule, though it will need screening. Keep it accessible in your carry-on.

Do the same TSA rules apply when flying out of non-U.S. airports?

No. These limits apply to U.S. checkpoints. Other countries follow their own rules—often similar but different on container sizes and bag counts. If connecting through an international airport, check local guidance before packing.