How to Choose the Right Size Carry-On Bag

Choosing the right carry-on size comes down to three things:

1. Which airline on your journey has the strictest carry-on dimensions
2. How long are you traveling for, and what are you going to do
3. Are you going to take a personal item as well? 

Over the years, we've had lots of feedback from customers about which airlines are the strictest and which types of bags seem most efficient on their journeys.

Here are our best tips:

What are the standard carry-on dimensions, and how do you measure your bag against them?

• In the United States, most major airlines use 22 by 14 by 9 inches (56 by 36 by 23 cm), including wheels and handles.
• In Europe, most full-service carriers use 55 by 40 by 23 cm. Budget carriers vary considerably and almost always run smaller.

Delta publishes the US mainline standard at 45 linear inches total, with wheels and handles included.

United, American and most other US majors use the same numbers.

The IATA cabin baggage recommendation is wider still at 56 by 45 by 25 cm, but most airlines do not accept the full IATA size. IATA is a recommendation to carriers, not a rule travelers can rely on.

The measurement gotcha that catches first-time buyers: the airline measures your bag with the wheels, the telescoping handle housing and any external feet included. A bag advertised as 22 inches in the body might be 24 inches at the gate sizer once the wheels and handle are added. Always check the wheels-and-handle measurement on the spec sheet, not the body alone.

A 24-inch suitcase is not a carry-on at the US mainline standard. Most carry-ons sit at 21 or 22 inches. A 24-inch bag is a medium check-in size unless the airline you fly with explicitly allows it.

Looking for a travel bag that meets carry-on requirements and looks professional? See our range here.

If you fly different airlines, how do you decide?

You need a bag that fits the strictest airline requirements you travel with. 

The practical version: if you fly American Airlines six times a year and Ryanair twice, you should buy to Ryanair's free underseat allowance, or accept paying for the larger Ryanair cabin bag on those two trips.

The cost of being wrong is real: a 22-inch US carry-on that fits Delta perfectly will not pass the Ryanair gate sizer, and the gate-check fee on Ryanair is often higher than the bag.

More examples of dimensions from different carriers:

• US mainline (Delta, United, American): 22 by 14 by 9 inches.
• US budget (Spirit): 22 by 18 by 10 inches. Wider than the mainline.
• US budget (Frontier): 24 by 16 by 10 inches. Wider still, but weight-enforced.
• European full-service (British Airways, Lufthansa, KLM): 55 by 40 by 23 cm.
• European budget (Ryanair): 40 by 25 by 20 cm free underseat; 55 by 40 by 20 cm for the paid cabin upgrade.
• European budget (EasyJet, Wizz Air): similar to Ryanair, with small variations year to year.

If you fly Ryanair, EasyJet or Wizz Air once a year, paying the cabin-bag fee on that single trip is cheaper than buying a smaller bag to fit them. If you fly budget European routes monthly, a bag that fits the free underseat allowance saves you the fee every flight.

What's a personal item, and how do you use it alongside your carry-on?

Most airlines let you bring a carry-on plus a smaller personal item that fits under the seat in front of you. Used together, the two bags roughly double your cabin capacity. Most travelers leave the second allowance unused.

Typical personal-item dimensions sit around 18 by 14 by 8 inches (45 by 35 by 20 cm), though airlines often define the limit by under-seat fit rather than a precise size. A briefcase, a messenger bag, a laptop bag, a tote or a small backpack all qualify. For business travelers, the natural pairing is a wheeled carry-on overhead and a structured leather briefcase or laptop bag underseat, holding the laptop, charger, documents and an overnight kit within reach during the flight.

This pairing is the optimization a frequent flyer makes: a maxed-out carry-on for the long stay, plus a structured personal item for everything you need at the seat. The second bag is free, and using it well removes most of the pressure on the main carry-on.

One catch on budget carriers: Ryanair, Spirit and some other low-cost lines charge for the larger carry-on but include the personal item free. If you fly them regularly for short trips, you can sometimes get by with just a personal-item-sized bag and skip the overhead-bag fee entirely.

We go into detail about carry-ons vs personal items here.

What size carry-on do you need for a weekend trip versus a longer one?

• For one to three nights, a smaller carry-on at around 35 to 40 litres or under 21 inches is usually enough.
• For four to seven nights, you want the full 22-inch standard. Past a week, accept that you may need to check a bag or pack lighter.

Trip length determines what you pack and the size of the bag you need. Clothes only is one choice; clothes plus work gear is another; clothes plus formalwear is a third. As a rough guide: 20 to 30 litres covers a long weekend, 35 to 45 litres covers a full week, and you start needing 45 litres or more once you add tech, gym kit or formalwear to a week-long trip.

A bigger bag is not always better. A half-empty 22-inch carry-on weighs more empty than a properly sized one, takes more shoulder weight on a long terminal walk, and tempts you to overpack just to fill the space. Travelers with predictable trip patterns often buy two bags rather than one compromise size: a smaller weekender for the overnight trip and a full 22-inch carry-on for the longer one.

Our Weekender sits at the short-trip end of this split, with a 16-inch padded laptop sleeve that lets it double as a generous personal item on longer trips.

When does a garment bag become the better carry-on choice?

When you are traveling with a suit, a formal dress or anything you cannot fold without creasing. Most business travelers reach for a garment bag when the trip includes a wedding, a presentation, a court appearance, a client dinner or back-to-back meetings where wrinkled clothes are not an option.

You have three ways to travel with a suit, each with a trade-off:

1. Wear it at the airport. No fold creases, but you risk seat creases on the flight, sweat at security and food spills at the gate.
2. Fold it into a regular carry-on. Convenient but the fold lines are visible on arrival unless you have time at the destination to hang and steam.
3. Carry a dedicated garment bag or garment-duffel. The suit hangs flat through the flight (or is built into the bag lining) and arrives ready to wear.

A traditional garment bag carries the suit only, and is often treated as a separate gate-check item rather than a true carry-on.

A garment-duffel hybrid is the two-in-one format: a fold-flat garment compartment for the suit, plus a duffel section for the rest of the trip's clothes, that folds together to carry-on dimensions for the cabin.

The hybrid is what most multi-day business travelers settle on once they have tried both. We make the Grand as a garment-duffel hybrid: a removable hanger inside the suit-hanging compartment, the same Italian Cuoio Superiore vegetable-tanned full-grain leather we use across the luggage range, and a folded profile that meets the US 22-inch carry-on standard.

For more on the form factor, our guide to garment-duffel bags covers the construction differences in detail.

Should you choose a spinner, roller, backpack, or duffel?

The right carry style depends on how you move through your trip. Airports and smooth floors favor four-wheel spinners. Cobblestones and stairs favor two-wheel rollers or a backpack. Short overnight stays often work best as a soft duffel or weekender.

The four main styles and the trip pattern each suits:

• Four-wheel spinner suitcase. Best for airport-to-hotel transfers via taxi or rideshare, smooth terminal floors, narrow aisles where you need to roll sideways. Less good on rough pavement; the spinner wheels stress and fail faster on cobblestones.
• Two-wheel roller suitcase. Better on rough pavement, train platforms and jet-bridge gaps. Lighter than a comparable spinner since two wheels don't intrude into the interior. The slight trade-off is less maneuverability in narrow aisles.
• Carry-on backpack. Best for stairs, train travel and walking cities. Hands-free, no rolling resistance, and easier to lift overhead. The trade-off is shoulder load on long walks.
• Duffel or weekender. Most forgiving for soft overhead bins, often passes as a personal item on stricter carriers, ideal for short trips. The trade-off is one-shoulder carry weight on longer walks.

Weight matters as much as carry style. Many travelers underestimate how much an empty hard-shell spinner weighs: 3 to 4 kg empty is common, sometimes more. On strict budget carriers with weight limits, every kilogram of empty bag is a kilogram of clothes you cannot bring.

Our Voyager is the only wheeled carry-on in our range: a soft-sided structured leather body with 360-degree spinner wheels, a two-stage telescoping handle and a 4 kg empty weight that holds against most full-service airline allowances.

Is a hard-shell or soft-sided carry-on better for your trips?

Hard-shell protects fragile items and keeps you honest about overpacking. Soft-sided squeezes into tight overhead bins and gives you external pockets for everything you need at security.

The hard-shell trade-off: polycarbonate or ABS is rigid. It will not bulge past the size limit at the gate, which is useful, but it also will not squeeze into a bin that is already half full. You either fit or you do not.

The soft-sided trade-off: ballistic nylon or leather flexes, so you can usually make a tight bin work. The risk is the opposite of hard-shell: you can overpack the bag past the airline's actual limit and only find out at the gate.

A third option sits between them: structured soft-sided, where leather or canvas wraps an internal frame. The frame holds shape so the bag does not bulge, but the outer material gives slightly under pressure. This is the format most luxury leather carry-ons take.

Material also matters for how the bag ages. Polycarbonate scratches, and the scratches stay. Ballistic nylon scuffs, fades at corners and looks tired after a few years of heavy use. Full-grain vegetable-tanned leather develops a patina, deepening in color and softening at handles where you grip it most. Buyers who keep a bag for ten years usually choose by how each material ages, rather than by which is lightest at year one.

We compare the best carry-on bags in more detail here.

What happens if your carry-on is too big at the gate?

The gate agent puts the bag in a metal sizing frame. If it does not fit, you are asked to gate-check it, often for a fee. On strict budget carriers, the fee at the gate is significantly higher than the fee paid online during booking.

What triggers the check: a visibly oversized bag, an obviously overstuffed shape, or random checks at busy gates. The fee range varies by carrier. US mainline carriers often charge $50-75 at the gate compared to $35-40 paid online. Ryanair is well known for charging £60-70 at the gate for an oversized cabin bag that did not fit the sizer. Beyond the fee, the bag goes to the hold, you wait at baggage claim and you carry the risk of damage on the way.

The most common ways travelers get caught:

• Buying to the most generous airline they fly and forgetting about the strict one they fly twice a year.
• Not measuring wheels and handles before assuming a 22-inch bag is 22 inches at the gate.
• Expanding the bag past its non-expanded dimensions and forgetting the airline measures the maximum profile.

If it happens at the gate: most agents check expansion zippers first, so unzipping any expansion is the cheapest fix. Emptying soft external pockets that protrude often gets a soft-sided bag through. After that, a gate-check is the realistic outcome.

Have the carry-on luggage rules changed for 2026?

The size limits at most major US and European carriers have not changed in 2026. The 22 by 14 by 9 inch US standard and the 55 by 40 by 23 cm European standard are still current. The bag you buy today should still pass the same airlines in 2030.

Where rules are actively shifting: some EU budget carriers have tightened personal-item enforcement, with stricter checks at the gate and higher fees. US carriers occasionally update personal-item allowances. Long-haul international flights, especially on Asian and Middle Eastern carriers, increasingly enforce a 7 kg cabin baggage weight cap that travelers from Europe and the US sometimes do not expect.

One useful clarification: the TSA does not set carry-on size or weight limits. Size and weight are set by each individual airline. The TSA's role is security screening, not baggage sizing. If you read a guide claiming "TSA carry-on size," it is using the term loosely; the airline you fly with is the one whose limits apply.

Check your specific airline's baggage page before each trip, but do not expect dimensions to change. Practical takeaway: buy for the strictest carrier you fly with, match the size to your typical trip rather than the longest one you might take, and use your personal-item allowance to take the pressure off the main bag.

For more on the next decisions after size, our quality travel bag checklist walks through what to look for in materials, hardware and construction.