Airline carry-on rules
Maximum carry-on size and weight for nearly 200 airlines — with a link to each airline's official policy so you can double-check before you fly.
A few airlines are updated every week, with a focus on the major carriers. Spot something out of date? Email john@onebag.travel and I'll fix it.
Watch the weight
- Airlines are charging more baggage fees than ever.
- Bags do get weighed at the gate — I've had mine weighed at check-in.
- A cheap luggage scale pays for itself on the first trip.
199 airlines
| Airline | Max size (cm) | Max size (in) | Linear | kg | lbs | Personal item (cm) | Carry-on free? | |
|---|---|---|---|---|---|---|---|---|
| Adria Airways | — | — | 118 cm | 8 | 17.6 | — | — | Bags that fit → |
| Aegean Airlines | 56×45×25 | 23×18×10 | — | 8 | 17.6 | — | Free | Bags that fit → |
| Aer Lingus | 55×40×24 | 22×16×10 | — | 10 | 22 | 40×30×20 | Free | Bags that fit → |
| Aeroflot | 55×40×25 | 21.7×16×10 | — | 10 | 22 | — | Free | Bags that fit → |
| Aerolineas Argentinas | 55×35×25 | — | 115 cm | 10 | 22 | 40×30×30 | Free | Bags that fit → |
| Aeromexico | 55×40×25 | 22×16×10 | — | 10 | 22 | — | — | Bags that fit → |
| Aeropostal Alas de Venezuela | — | — | — | 8 | 17.6 | — | — | Bags that fit → |
| Air Asia | 56×36×23 | 23×15×10 | — | 7 | 15.4 | 40×30×10 | Free | Bags that fit → |
| Air Astana | 56×45×25 | 23×18×10 | — | — | — | — | Free | Bags that fit → |
| Air Baltic | 55×40×20 | 22×16×8 | — | 8 | 17.6 | 40×30×15 | Free | Bags that fit → |
| Air Berlin (Closed) | — | — | — | — | — | — | — | Bags that fit → |
| Air Canada | 55×40×23 | 22×16×10 | — | — | — | 43×33×16 | Free | Bags that fit → |
| Air Caraibes | 55×45×25 | 22×18×10 | — | 12 | 26.4 | 40×30×15 | Free | Bags that fit → |
| Air China | 55×40×20 | 22×16×8 | — | 8 | 17.6 | — | Free | Bags that fit → |
| Air Europa | — | — | 115 cm | 10 | 22 | 40×30×10 | Free | Bags that fit → |
| Air France | 55×35×25 | 22×14×10 | — | 12 | 26.4 | 40×30×15 | Paid | Bags that fit → |
| Air India | 55×35×25 | 22×14×10 | — | 8 | 17.6 | 40×30×10 | Free | Bags that fit → |
| Air Koryo | — | — | 115 cm | 5 | 11 | — | — | Bags that fit → |
| Air Macau | 56×36×23 | 23×15×10 | — | 7 | 15.4 | — | Free | Bags that fit → |
| Air Malta | 55×40×20 | 22×16×8 | — | 10 | 22 | — | — | Bags that fit → |
| Air Mauritius | 55×35×25 | — | 115 cm | 7 | 0 | — | — | Bags that fit → |
| Air New Zealand | — | — | 118 cm | 7 | 15.4 | 40×30×10 | Free | Bags that fit → |
| Air Niugini | 50×30×20 | 20×12×8 | — | 10 | 22 | — | Free | Bags that fit → |
| Air Nostrum | 56×45×25 | 23×18×10 | — | — | — | — | Free | Bags that fit → |
| Air Serbia | 55×40×20 | 22×16×8 | — | 8 | 17.6 | — | Free | Bags that fit → |
| Air Seychelles | 55×40×20 | 22×16×8 | — | 7 | 15.4 | — | Free | Bags that fit → |
| Air Tahiti | 45×35×20 | 18×14×8 | — | 5 | 11 | — | Free | Bags that fit → |
| Air Tahiti Nui | — | — | 115 cm | 10 | 22 | — | — | Bags that fit → |
| Air Transat | — | — | — | — | — | — | Free | Bags that fit → |
| Air Wisconsin | 56×36×23 | 22×14×9 | — | — | — | — | — | Bags that fit → |
| AirAsiaX | 56×36×23 | 23×15×10 | — | 7 | 15.4 | — | — | Bags that fit → |
| Aircalin | — | — | — | — | — | 40×30×20 | Free | Bags that fit → |
| Alaska Airlines | 56×36×23 | 22×14×9 | — | — | — | 45×35×20 | Free | Bags that fit → |
| Alitalia | — | — | — | — | — | — | — | Bags that fit → |
| All Nipon Airways | 55×40×25 | 22×16×10 | 115 cm | 10 | 22 | — | — | Bags that fit → |
| Allegiant Air | 56×36×23 | 22×14×9 | — | — | — | 45×35×20 | Paid | Bags that fit → |
| American Airlines | 56×36×23 | 22×14×9 | — | — | — | 45×35×20 | Free | Bags that fit → |
| American Eagle | 46×36×21 | 18×14×8 | — | — | — | — | — | Bags that fit → |
| ANA | 55×40×25 | 22×16×10 | 115 cm | 10 | 22 | 40×30×10 | Free | Bags that fit → |
| Asiana Airlines | 55×40×20 | 22×16×8 | 115 cm | 10 | 22 | 40×30×20 | Free | Bags that fit → |
| ATA Airlines | 55×40×20 | 22×16×8 | — | — | — | — | — | Bags that fit → |
| Atlas Global | 56×45×25 | 23×18×10 | — | 8 | 17.6 | — | — | Bags that fit → |
| Austrian | 55×40×23 | 22×16×10 | — | 8 | 17.6 | 40×30×10 | Free | Bags that fit → |
| Avianca | 56×36×23 | 23×15×10 | 115 cm | 10 | 22 | 45×35×20 | Paid | Bags that fit → |
| Azerbaijan Airlines | 55×40×23 | 22×16×10 | 118 cm | 10 | 22 | — | Free | Bags that fit → |
| Azul Airlines | — | — | 155 cm | 10 | 22 | 35×25×25 | Free | Bags that fit → |
| Azul Linhas | — | — | 115 cm | 10 | 22 | — | — | Bags that fit → |
| Bahamasair | 56×36×23 | 23×15×10 | 115 cm | — | — | — | Free | Bags that fit → |
| Bangkok Airways | 56×36×23 | 23×15×10 | — | 5 | 11 | — | Free | Bags that fit → |
| Belavia | 50×40×20 | 20×16×8 | 115 cm | 12 | 26.4 | — | Free | Bags that fit → |
| Biman Bangladesh | 56×36×23 | 23×15×10 | — | 7 | 15.4 | 50×36×20 | Free | Bags that fit → |
| Blue Air | 55×40×20 | 22×16×8 | — | 10 | 22 | — | — | Bags that fit → |
| Boliviana de Aviacion | 55×35×25 | 22×14×10 | — | 7 | 15.4 | — | — | Bags that fit → |
| British Airways | 56×45×25 | 23×18×10 | — | 23 | 50.6 | 40×30×15 | Free | Bags that fit → |
| Brussels Airlines | 55×40×23 | 23×15.7×9.1 | — | 8 | 26.4 | — | — | Bags that fit → |
| Bulgaria Air | 55×40×20 | 22×16×8 | 118 cm | 10 | 22 | 40×30×15 | Free | Bags that fit → |
| Cambodia Angkor Air | 56×36×23 | 23×15×10 | 115 cm | 7 | 15.4 | — | Free | Bags that fit → |
| Cape Air | — | — | — | — | — | — | — | Bags that fit → |
| Caribbean Airlines | — | — | 114 cm | 10 | 22 | — | — | Bags that fit → |
| Cathay Pacific | 56×36×23 | 23×15×10 | — | 7 | 15.4 | 40×30×15 | Free | Bags that fit → |
| Cayman Airways | 59×34×23 | 23×13×9 | 158 cm | 18.2 | 40 | — | Free | Bags that fit → |
| Cebu Pacific | 56×36×23 | 23×15×10 | — | 7 | 15.4 | — | Free | Bags that fit → |
| China Airlines | 56×36×23 | 23×15×10 | — | 7 | 15.4 | 40×30×15 | Free | Bags that fit → |
| China Eastern | 55×40×20 | 22×16×8 | — | — | — | — | Free | Bags that fit → |
| China Southern | — | — | 115 cm | 5 | 11 | 40×30×10 | Free | Bags that fit → |
| CommutAir | 56×36×23 | 22×14×9 | — | — | — | — | — | Bags that fit → |
| Conviasa | 61×37×25 | 25×15×10 | 123 cm | — | — | — | Free | Bags that fit → |
| Copa Airlines | 56×36×26 | 23×15×11 | — | 10 | 22 | 43×25×22 | Free | Bags that fit → |
| Croatia Air | — | — | 112 cm | 8 | 17.6 | — | Free | Bags that fit → |
| Cubana de Aviacion | — | — | 115 cm | 5 | 11 | — | — | Bags that fit → |
| Czech Airlines | 55×45×25 | 22×18×10 | — | 8 | 17.6 | — | Free | Bags that fit → |
| Delta Airlines | 56×36×23 | 22×14×9 | — | — | — | 45×35×20 | Free | Bags that fit → |
| Dragonair | 56×36×23 | 23×15×10 | — | 7 | 15.4 | — | — | Bags that fit → |
| easyJet | 46×36×20 | 19×15×8 | — | — | — | 45×36×20 | Paid | Bags that fit → |
| EL AL | 56×45×25 | 23×18×10 | — | 8 | 17.6 | 38×30×18 | Paid | Bags that fit → |
| Emirates Airlines | 55×38×20 | 22×15×8 | — | 7 | 15.4 | — | Free | Bags that fit → |
| Enter Air | 55×40×20 | 22×16×8 | — | 5 | 11 | — | — | Bags that fit → |
| Ethiopian Airlines | 55×40×23 | 22×16×10 | — | 7 | 15.4 | — | Free | Bags that fit → |
| Etihad Airways | 50×40×25 | 20×16×10 | — | 7 | 15.4 | 39×23×19 | Free | Bags that fit → |
| Eurowings | 55×40×23 | 22×16×10 | — | — | — | 40×30×25 | Free | Bags that fit → |
| EVA Air | 56×36×23 | 23×15×10 | — | 7 | 15.4 | 40×30×10 | Free | Bags that fit → |
| Fiji Airways | 55×40×23 | 22×16×10 | — | 7 | 15.4 | — | Free | Bags that fit → |
| Finnair | 56×45×25 | 23×18×10 | — | — | — | 40×30×15 | Paid | Bags that fit → |
| Flair Air | 55×40×23 | — | — | 7 | 0 | 43×33×15 | Paid | Bags that fit → |
| flybe | 55×35×20 | 22×14×8 | — | 10 | 22 | — | — | Bags that fit → |
| Frontier Airlines | 61×41×26 | 24×16×10 | — | 15.9 | 35 | 46×36×20 | Paid | Bags that fit → |
| Garuda Indonesia | 56×36×23 | 23×15×10 | 115 cm | 7 | 15.4 | — | Free | Bags that fit → |
| Gol Linhas Aereas | 55×40×25 | 22×16×10 | — | 10 | 22 | — | — | Bags that fit → |
| Great Lakes Airlines | 56×28×28 | 22×11×11 | — | — | — | — | — | Bags that fit → |
| Gulf Air | 45×40×30 | 18×16×12 | — | 6 | 13.2 | 45×40×30 | Paid | Bags that fit → |
| Hainan Airlines | — | — | 115 cm | 10 | 22 | 40×30×10 | Free | Bags that fit → |
| Hawaiian Airlines | 56×36×23 | 22×14×9 | — | 11.4 | 25 | — | Free | Bags that fit → |
| Hong Kong Airlines | 56×36×23 | 23×15×10 | — | 7 | 15.4 | 40×30×15 | Free | Bags that fit → |
| Iberia | 55×45×25 | 22×18×10 | — | — | — | 40×30×15 | Free | Bags that fit → |
| Icelandair | 55×40×20 | 22×16×8 | — | 10 | 22 | 40×30×15 | Free | Bags that fit → |
| Indigo | 55×35×25 | 22×14×10 | — | 7 | 15.4 | — | Free | Bags that fit → |
| InselAir | 55×35×20 | 22×14×8 | — | — | — | — | — | Bags that fit → |
| Interjet | 55×40×25 | 22×16×10 | — | 10 | 22 | — | — | Bags that fit → |
| Iran Air | 55×45×25 | 22×18×10 | 115 cm | 7 | 15.4 | 45×30×20 | Paid | Bags that fit → |
| Iran Aseman Air | 56×45×25 | 23×18×10 | 115 cm | 5 | 11 | — | — | Bags that fit → |
| Island Air | 64×49×28 | 25×19×10.9 | — | — | — | — | Free | Bags that fit → |
| Japan Airlines | 55×40×25 | 22×16×10 | — | 10 | 22 | — | Free | Bags that fit → |
| Jet Airways | 55×35×25 | 22×14×10 | — | 7 | 15.4 | — | — | Bags that fit → |
| Jet2 | 56×45×25 | 23×18×10 | — | 10 | 22 | 40×30×15 | Free | Bags that fit → |
| jetBlue Airways | 56×36×23 | 22×14×9 | — | — | — | 43×33×20 | Free | Bags that fit → |
| Jetstar Airways | 56×36×23 | 23×15×10 | — | 7 | 15.4 | 40×30×10 | Free | Bags that fit → |
| Jetstar Asia | 56×36×23 | 23×15×10 | — | 7 | 15.4 | — | — | Bags that fit → |
| Juneyao Airlines | 55×40×20 | 22×16×8 | — | 5 | 11 | — | Free | Bags that fit → |
| Kenya Airways | 55×35×25 | 22×14×10 | — | 18 | 39.6 | — | Free | Bags that fit → |
| KLM | 55×35×25 | 22×14×10 | — | 12 | 26.4 | 40×30×15 | Free | Bags that fit → |
| Korean Air | — | — | 115 cm | 12 | 26.4 | 40×30×10 | Free | Bags that fit → |
| Kulula | 56×36×23 | 23×15×10 | — | 7 | 15.4 | — | Free | Bags that fit → |
| Kuwait Air | 56×46×25 | 23×19×10 | — | 7 | 15.4 | — | Free | Bags that fit → |
| LATAM | 55×35×25 | 22×14×10 | — | 8 | 17.6 | 45×35×20 | Free | Bags that fit → |
| LC Perú | 40×30×20 | 16×12×8 | — | 9 | 19.8 | — | — | Bags that fit → |
| Liat Airlines | 54×36×21 | 21×14×8 | — | 6.8 | 15 | — | — | Bags that fit → |
| Linea Aerea Amaszonas | 30×27×20 | 12×11×8 | — | 5 | 11 | — | — | Bags that fit → |
| Lion Air Group | 40×30×20 | 16×12×8 | — | 7 | 15.4 | — | Free | Bags that fit → |
| LOT Polish | 55×40×23 | 22×16×10 | — | 8 | 17.6 | 40×35×12 | Free | Bags that fit → |
| Lufthansa | 55×40×23 | 22×16×10 | — | 8 | 17.6 | 40×30×15 | Free | Bags that fit → |
| Luxair | 55×40×20 | 22×16×8 | — | 8 | 17.6 | 40×30×20 | Free | Bags that fit → |
| Mahan Air | 55×40×23 | 22×16×10 | — | 5 | 11 | — | Free | Bags that fit → |
| Malaysia Airlines | 56×36×23 | 23×15×10 | — | 7 | 15.4 | — | Free | Bags that fit → |
| Mango | 56×36×23 | 23×15×10 | 115 cm | 7 | 15.4 | 40×30×10 | Paid | Bags that fit → |
| Meridiana Fly | 55×40×20 | 22×16×8 | — | 8 | 17.6 | — | — | Bags that fit → |
| Mesa Airlines | 55×40×23 | 21.5×15.5×9 | — | 10 | 22 | 22×14×9 | Free | Bags that fit → |
| Middle East Airlines | 56×40×25 | 23×16×10 | — | 5 | 11 | 40×30×10 | Free | Bags that fit → |
| Monarch Airlines | 56×40×25 | 23×16×10 | — | 5 | 11 | — | — | Bags that fit → |
| Nordwind Airlines | 55×40×20 | 22×16×8 | 115 cm | 5 | 11 | — | — | Bags that fit → |
| Norwegian | 55×40×23 | 22×16×10 | — | 10 | 22 | 40×30×20 | Paid | Bags that fit → |
| Oman Air | 51×41×24 | 21×17×10 | — | — | — | — | Free | Bags that fit → |
| Onur Air | 56×45×25 | 23×18×10 | — | 8 | 17.6 | — | Free | Bags that fit → |
| Pakistan International | 55×38×22 | 22×15×9 | 115 cm | 7 | 15.4 | — | Free | Bags that fit → |
| Peach | 55×40×25 | 22×16×10 | — | 10 | 22 | — | Free | Bags that fit → |
| Pegasus Airlines | — | — | — | 8 | 17.6 | — | — | Bags that fit → |
| PenAir | 61×44×26 | 24×17×10 | — | 11.4 | 25 | — | — | Bags that fit → |
| Philippine Airlines | — | — | 115 cm | 7 | 15.4 | — | — | Bags that fit → |
| Porter Airlines | 55×40×23 | 22×16×10 | — | 9 | 19.8 | 43×33×16 | Paid | Bags that fit → |
| Qantas Airways | 56×36×23 | 23×15×10 | 115 cm | 7 | 15.4 | 40×30×10 | Free | Bags that fit → |
| Qatar Airways | 50×37×25 | 20×15×10 | — | 7 | 15.4 | 40×30×15 | Free | Bags that fit → |
| Ravn Alaska | 46×36×26 | 18×14×10 | — | 9.1 | 20 | 40.6×35.6×22.9 | Paid | Bags that fit → |
| Regional Express | 48×34×23 | 19×14×10 | — | 7 | 15.4 | 30×20×10 | Free | Bags that fit → |
| Republic Airways | 56×36×23 | 22×14×9 | — | — | — | — | — | Bags that fit → |
| Royal Air Morocco | — | — | 115 cm | 10 | 22 | — | — | Bags that fit → |
| Royal Brunei Airlines | 55×38×20 | 22×15×8 | — | 7 | 15.4 | — | Free | Bags that fit → |
| Royal Jordanian | 51×40×23 | 21×16×10 | 115 cm | 7 | 15.4 | — | Free | Bags that fit → |
| Ryanair | 55×40×20 | 22×16×8 | — | 10 | 22 | 40×30×20 | Paid | Bags that fit → |
| S7 | 55×40×20 | 22×16×8 | — | 10 | 22 | — | Free | Bags that fit → |
| SAS Scandinavian | 55×40×23 | 22×16×10 | 115 cm | 8 | 17.6 | 40×30×15 | Free | Bags that fit → |
| Saudi Arabian Airlines | — | — | 115 cm | 9 | 19.8 | — | Free | Bags that fit → |
| Scoot | 54×38×23 | 22×15×10 | — | 7 | 15.4 | — | Free | Bags that fit → |
| Shandong Airlines | 55×40×20 | 22×16×8 | — | — | — | — | Free | Bags that fit → |
| Shenzhen Airlines | 55×40×20 | 22×16×8 | — | 5 | 11 | — | Free | Bags that fit → |
| Sichuan Airlines | — | — | 115 cm | 10 | 22 | — | — | Bags that fit → |
| SilkAir | — | — | 115 cm | 7 | 15.4 | — | — | Bags that fit → |
| Silver Airways | — | — | 115 cm | — | — | — | — | Bags that fit → |
| Singapore Airlines | — | — | 115 cm | 7 | 15.4 | 40×30×10 | Free | Bags that fit → |
| Sky Airlines | 55×35×25 | 22×14×10 | — | 20 | 44 | 45×35×25 | Paid | Bags that fit → |
| Skywest, Inc. | 56×36×23 | 23×15×10 | — | — | — | — | — | Bags that fit → |
| South African Airways | 56×36×23 | 23×15×10 | — | 8 | 17.6 | — | Free | Bags that fit → |
| Southwest Airlines | 61×41×26 | 24×16×10 | — | — | — | 46×34×21 | Paid | Bags that fit → |
| SpiceJet | — | — | 115 cm | 7 | 15.4 | — | — | Bags that fit → |
| Spirit Airlines | 56×46×26 | 22×18×10 | — | — | — | 45×35×20 | Paid | Bags that fit → |
| Spring Airlines | 40×30×20 | 16×12×8 | — | 7 | 15.4 | — | Free | Bags that fit → |
| SriLankan Airlines | 56×36×23 | 23×15×10 | 115 cm | 7 | 15.4 | — | Free | Bags that fit → |
| Sun Country | 61×41×28 | 24×16×11 | — | — | — | — | Free | Bags that fit → |
| Sun Express | 55×40×20 | 22×16×8 | — | 8 | 17.6 | 40×30×20 | Paid | Bags that fit → |
| Swiss Int'l Air Lines | 55×40×23 | 22×16×10 | — | 8 | 17.6 | 40×30×15 | Free | Bags that fit → |
| TAAG Angola | — | — | 115 cm | 8 | 17.6 | — | Free | Bags that fit → |
| TAM Airlines | — | — | 115 cm | 5 | 11 | — | — | Bags that fit → |
| TAP Air Portugal | 55×40×20 | 22×16×8 | 115 cm | 10 | 22 | 40×30×15 | Free | Bags that fit → |
| TAROM | 55×40×20 | 22×16×8 | — | 10 | 22 | — | Free | Bags that fit → |
| Thai Airways | 56×45×25 | 23×18×10 | — | 7 | 15.4 | 37×25×12 | Free | Bags that fit → |
| Tianjin Airlines (A320 & E190) | 55×40×20 | 22×16×8 | — | 5 | 11 | — | — | Bags that fit → |
| Tianjin Airlines (E145) | 35×25×15 | 14×10×6 | — | 5 | 11 | — | — | Bags that fit → |
| Tiger Airways | 54×38×23 | 22×15×10 | — | 7 | 15.4 | — | — | Bags that fit → |
| Trans States | 56×36×23 | 22×14×9 | — | — | — | — | — | Bags that fit → |
| Travel Service Airlines | 56×45×25 | 23×18×10 | — | 8 | 17.6 | — | — | Bags that fit → |
| TUI | 55×40×20 | 22×16×8 | — | 5 | 11 | 40×30×20 | Free | Bags that fit → |
| Turkish Airlines | 55×40×23 | 22×16×10 | — | 8 | 17.6 | 40×30×15 | Free | Bags that fit → |
| Turkmenistan Airlines | — | — | — | 5 | 11 | 45×35×15 | Paid | Bags that fit → |
| Ukraine International | 55×40×20 | 22×16×8 | — | 7 | 15.4 | — | Free | Bags that fit → |
| United Airlines | 56×36×23 | 22×14×9 | — | — | — | 43×25×22 | Free | Bags that fit → |
| Ural Airlines | — | — | 115 cm | 5 | 11 | — | — | Bags that fit → |
| uTair Airlines | — | — | — | — | — | 40×30×20 | Paid | Bags that fit → |
| Uzbekistan Air | 56×45×25 | 23×18×10 | 115 cm | — | — | — | Free | Bags that fit → |
| Vietnam Airlines | 56×36×23 | 23×15×10 | 115 cm | 7 | 15.4 | 40×30×15 | Free | Bags that fit → |
| VIM Airlines (Closed) | 55×40×20 | 22×16×8 | — | — | — | — | — | Bags that fit → |
| Virgin America | — | — | 130 cm | 6.4 | 14 | — | — | Bags that fit → |
| Virgin Atlantic | 56×36×23 | 23×15×10 | — | 10 | 22 | 40×30×15 | Free | Bags that fit → |
| Virgin Australia | 48×34×23 | 19×14×10 | — | 7 | 15.4 | 48×34×23 | Free | Bags that fit → |
| Vivaaerobus | — | — | — | 15 | 33 | 40×30×10 | Paid | Bags that fit → |
| VivaColombia | 40×35×25 | 16×14×10 | — | 6 | 13.2 | — | — | Bags that fit → |
| Volaris | 40×40×25 | 16×16×10 | — | 10 | 22 | 22×16×10 | Free | Bags that fit → |
| Volotea | 55×40×20 | 22×16×8 | — | 10 | 22 | 40×30×20 | Paid | Bags that fit → |
| WestJet | 53×38×23 | 21×15×10 | — | — | — | 40×33×14 | Free | Bags that fit → |
| Wizz Air | 40×30×20 | 15.7×11.8×7.9 | — | 10 | 22 | 40×30×20 | Paid | Bags that fit → |
| WOW Airlines | 56×45×25 | 23×18×10 | — | 12 | 26.4 | — | — | Bags that fit → |
| Xiamen | 55×40×20 | 22×16×8 | — | 5 | 11 | — | Free | Bags that fit → |
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How airline carry-on rules work
Carry-on bags have to fit in the overhead bin or under the seat in front of you. The size limit is commonly around 56×36×23 cm (22×14×9 in), but it varies by airline — and budget carriers are the strictest, both on size and on weight.
Anything over the limit gets checked, often with a fee at the gate. Certain items are also restricted regardless of bag size: hazardous materials, sharp objects, and liquids or gels over 100 ml / 3.4 oz (which must go in a clear, resealable bag).
The reliable move is to pick a bag that fits the airlines you actually fly, then pack light enough to stay under the weight limit. That's what this whole site is for.