Nothing derails a trip faster than a gate agent pointing at the sizer box. In 2026, carry-on rules are tighter than ever — airlines are measuring more strictly, fees are higher, and a 1‑centimeter overage can force you to check a bag you packed to avoid checking. This is the definitive, up-to-date guide to carry-on dimensions across every major airline, plus a simple rule of thumb that works no matter where you fly.
The global carry-on standard (and why it doesn't exist)
There is no single international standard for carry-on luggage. IATA recommends 56 × 45 × 25 cm (22 × 18 × 10 in), but fewer than half of airlines actually follow it. North American carriers cluster around 22 × 14 × 9 inches, European full-service airlines lean closer to 55 × 40 × 23 cm, and budget carriers across Europe and the Americas enforce the smallest envelopes of all.
The practical consequence: a bag that clears United in Denver may be rejected by Ryanair in Dublin. The only reliable approach is a bag that fits the strictest common denominator — and that is exactly why The Expansible Travel Bag was engineered at 21 × 9 × 12 inches compressed.
Full carry-on dimension table: 20+ airlines (2026)
| Airline | Max dimensions | Weight limit |
|---|---|---|
| United Airlines | 22 × 14 × 9 in (56 × 35 × 22 cm) | No published weight |
| American Airlines | 22 × 14 × 9 in | No published weight |
| Delta Air Lines | 22 × 14 × 9 in | No published weight |
| JetBlue | 22 × 14 × 9 in | No published weight |
| Southwest | 24 × 16 × 10 in | No published weight |
| Alaska Airlines | 22 × 14 × 9 in | No published weight |
| WestJet | 21 × 15 × 9 in (53 × 38 × 23 cm) | 10 kg |
| Air Canada | 21.5 × 15.5 × 9 in (55 × 40 × 23 cm) | 10 kg |
| Spirit Airlines | 22 × 18 × 10 in (paid) | No published weight |
| Frontier Airlines | 24 × 16 × 10 in (paid) | 35 lb |
| Lufthansa | 55 × 40 × 23 cm | 8 kg |
| Air France | 55 × 35 × 25 cm | 12 kg total |
| British Airways | 56 × 45 × 25 cm | 23 kg |
| Iberia | 56 × 40 × 25 cm | 10 kg |
| TAP Air Portugal | 55 × 40 × 20 cm | 8 kg |
| KLM | 55 × 35 × 25 cm | 12 kg |
| Ryanair | 55 × 40 × 20 cm (priority) | 10 kg |
| easyJet | 56 × 45 × 25 cm (large, paid) | 15 kg |
| Wizz Air | 55 × 40 × 23 cm (priority) | 10 kg |
| Emirates | 55 × 38 × 20 cm | 7 kg |
| Etihad | 56 × 40 × 25 cm | 7 kg |
| Qatar Airways | 50 × 37 × 25 cm | 7 kg economy |
| Turkish Airlines | 55 × 40 × 23 cm | 8 kg |
| Singapore Airlines | 115 cm linear | 7 kg |
| Cathay Pacific | 56 × 36 × 23 cm | 7 kg |
| LATAM | 55 × 35 × 25 cm | 10 kg |
| Avianca | 55 × 35 × 25 cm | 10 kg |
| Qantas | 56 × 36 × 23 cm | 7 kg |
The 21 × 9 × 12 rule: fits every airline above
Cross-reference every row in that table and a pattern appears: a bag at 21 × 9 × 12 inches (53 × 23 × 30 cm) fits inside every single sizer, including the notoriously strict European budget carriers. That is not a coincidence — it is the design target of the LOUVT Expansible Travel Bag.
Compressed, the bag slots into a Ryanair 55 × 40 × 20 cm sizer with room to spare. Expanded, it grows an extra 40% of internal volume for the flight home when you are carrying souvenirs. A trolley sleeve slides over the handle of any 22‑inch spinner, and the dedicated laptop pocket holds a 15" MacBook flat against the padded back panel.
Weight: the second trap
Dimensions are only half the story. European, Middle Eastern, and Asian carriers enforce weight limits that North American airlines ignore — commonly 7 to 10 kg. A hard-shell spinner often weighs 3.5 kg empty, which leaves only 3.5 kg of contents on an Emirates flight. A lightweight soft bag like the Expansible Travel Bag weighs under 1.2 kg, giving you back roughly 2.3 kg of packable capacity.
Frequently missed rules in 2026
- Personal item size: Most US carriers allow a personal item 18 × 14 × 8 in; budget carriers are shrinking this. A duffle that converts to a personal item saves a fee.
- Basic Economy: United, American, and Delta Basic Economy generally do not include a full carry-on on transatlantic routes — read the fare rules carefully.
- Codeshares: When British Airways sells you a seat on American, which rule applies? The operating carrier's. Check the flight number prefix.
Final verdict
If you fly more than four times a year, you need a carry-on sized for the strictest common denominator — not the most generous one. A 21‑inch expansible bag with a lightweight shell covers every scenario in the table above. Browse the Expansible Travel Bag, check our shipping policy, or read the companion guide on packing 14 days in one carry-on.