United Carry-On Size: Measure Your Bag and Check Basic Economy

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A bag can meet United's size limit without being included in your ticket. Before buying luggage or packing an overhead bag, check the allowance shown for your itinerary and fare. Basic Economy needs particular attention: do not assume it includes the same bags as standard Economy, or that every international route has the same exception.

First check what your booking includes

Open your reservation and the United Basic Economy rules. Record whether an overhead carry-on is included for your trip, rather than deciding from the ticket's price or the word “international.” Check any route, MileagePlus status or eligible credit-card exception against its exact conditions. A card with United branding alone does not establish eligibility.

If the booking allows only a personal item, plan around that smaller bag or compare the baggage/fare options United offers for your itinerary before departure. A bag that fits an overhead bin does not create a baggage entitlement. Use the amount shown for your booking; this guide does not quote a universal Basic Economy gate fee.

United size reference: two different bags

The following dimensions are the figures recorded from United's carry-on page on August 31, 2026. Check that page and your booking again before buying a bag or flying.

Include handles, wheels and protruding packed pockets. A retailer's “cabin approved,” “underseat” or litre capacity label is not a substitute for those measurements. Two bags with the same stated capacity can have different shapes.

Measure without creating a rounding error

1. Pack the bag as you intend to travel. Close any expansion zip you do not intend to use.
2. Measure the outside height, width and depth at the widest points, including handles and wheels. Do not measure only the empty shell.
3. Compare all three sides with the same published unit column. Check both the bag category and your booking's allowance.
4. If the bag is at the boundary or the airline's unit columns appear inconsistent, ask United to confirm before purchasing. Do not rely on an assumed tolerance at the airport.

Worked example: 22 × 14 × 9 inches matches the recorded inch dimensions. Converting its 14-inch side gives 35.56 cm. Comparing that exact conversion against a rounded 35 cm column does not establish that United rejects its own 14-inch size. Conversely, this arithmetic does not grant an extra half-centimetre tolerance to a different bag.

A 22 × 14 × 9-inch bag is also larger than the recorded personal-item box. Meeting the overhead size therefore does not solve a personal-item-only booking. A bag accepted by another airline is no guarantee of acceptance here; compare your actual measurements.

Check the whole itinerary before choosing a larger bag

Read the operating carrier and aircraft information for every leg, including regional connections. Allowance and available cabin storage are separate questions. Follow the operating carrier's instructions if a cabin bag must be checked.

For a checked bag, use United's checked-baggage guidance and your reservation to confirm the number of bags, weight, size and charges. Do not treat one standard weight figure as the allowance for every cabin, route and status.

Other airline guides

• Southwest Airlines carry-on and checked bag sizes
• Frontier Airlines carry-on and checked bag sizes
• Air Canada carry-on and checked bag sizes
• JetBlue carry-on and checked bag sizes
• American Airlines carry-on and checked bag sizes
• Delta Air Lines carry-on and checked bag sizes
• Korean Air carry-on and checked bag sizes

Related pages on TripPack

• All eight airlines in one table — cabin bags, personal items and fare conditions side by side.
• Carry-on packing list — what to actually put in the bag once you know it fits.
• How to measure a carry-on bag — where to hold the tape.
• Baggage weight limits explained.