Diggs Passenger vs SturdiBag Pro (Large, Flexible Height): which airline pet carrier?
Short answer: The Diggs Passenger is within the published size limit of more airlines: 6 of the 58 that publish one, against 2 for the SturdiBag Pro (Large, Flexible Height). In the table, the SturdiBag Pro (Large, Flexible Height) is amber for another 16 airlines: over the published size, so it would have to be collapsed, flexed or squeezed to go under the seat. Each amber row shows by how much.
Both carriers compared the way an airline sees them: by published size against each airline's under-seat limit. Diggs Passenger is 17 × 12 × 10.5 in; SturdiBag Pro (Large, Flexible Height) is 18 × 11.5 × 11.5 in.
Side by side
| Property | Diggs Passenger | SturdiBag Pro (Large, Flexible Height) |
|---|---|---|
| External size (L×W×H) | 17 × 12 × 10.5 in | 18 × 11.5 × 11.5 in |
| Type | soft-sided | soft-sided · flexible height |
| Pet weight | — | — |
| Airlines it fits outright | 6 of 58 | 2 of 58 |
Airline by airline
Green = within the published size; amber = fits only collapsed / flexed; grey = over. Height is strict — it's the dimension a seat won't negotiate on.
No airlines match.
| Airline | Passenger | Pro (Large, Flexible Height) |
|---|---|---|
| Aegean Airlines | Too big | Too big |
| Air Canada | Too tall (10.5" > 8") | Too big |
| Air Europa | Too big | Too big |
| Air France | Too big | Too big |
| Air Transat | Too big | Too big |
| airBaltic | Too tall (10.5" > 9.1") | Flexes — 2.4" over |
| Alaska Airlines | Too big | Too big |
| Alaska Horizon (Horizon Air) | Too big | Too big |
| Allegiant Air | Exact fit | Flexes — 0.5" over |
| American Airlines | Too big | Too big |
| American Eagle (regional, incl. Republic Airways) | Too big | Too big |
| Asiana Airlines | Too tall (10.5" > 8.2") | Too big |
| Austrian Airlines | Too tall (10.5" > 9.1") | Flexes — 2.4" over |
| Avelo Airlines | Too big | Too big |
| Avianca | Too tall (10.5" > 10") | Flexes — 1.5" over |
| Azul Linhas Aéreas | Too big | Too big |
| Breeze Airways | Too big | Too big |
| Brussels Airlines | Too tall (10.5" > 9.1") | Flexes — 2.4" over |
| Cape Air | Too tall (10.5" > 8.5") | Too big |
| Condor | Too tall (10.5" > 9") | Flexes — 2.5" over |
| Contour Airlines | Too tall (10.5" > 10") | Flexes — 1.5" over |
| Copa Airlines | Too big | Too big |
| Delta Air Lines | Too big | Too big |
| Discover Airlines | Too tall (10.5" > 9.1") | Flexes — 2.4" over |
| Edelweiss | Too tall (10.5" > 9.1") | Flexes — 2.4" over |
| EL AL Israel Airlines | Too big | Too big |
| Etihad Airways | Too big | Too big |
| Eurowings | Too tall (10.5" > 9.1") | Flexes — 2.4" over |
| Finnair | Too tall (10.5" > 7.9") | Flexes — 3.6" over |
| Frontier Airlines | Fits | Flexes — 0.5" over |
| GOL Linhas Aéreas | Too big | Too big |
| Hawaiian Airlines | Too big | Too big |
| Iberia | Too tall (10.5" > 9.8") | Too big |
| ITA Airways | Too tall (10.5" > 9.1") | Flexes — 2.4" over |
| JetBlue | Too tall (10.5" > 8.5") | Too big |
| JSX | Exact fit | Too big |
| KLM Royal Dutch Airlines | Too big | Too big |
| Korean Air | Too tall (10.5" > 7.5") | Too big |
| LATAM Airlines | Too big | Too big |
| LOT Polish Airlines | Too big | Too big |
| Lufthansa | Too tall (10.5" > 9.1") | Flexes — 2.4" over |
| Norwegian | Too big | Too big |
| Pegasus Airlines | Fits | Fits |
| Porter Airlines | Exact fit | Flexes — 1" over |
| Royal Air Maroc | Soft-sided not accepted | Soft-sided not accepted |
| SAS Scandinavian Airlines | Too big | Too big |
| Saudia | Fits | Fits |
| Southwest Airlines | Too big | Too big |
| Sun Country Airlines | Too tall (10.5" > 9") | Too big |
| Swiss International Air Lines | Too tall (10.5" > 9.1") | Flexes — 2.4" over |
| TAP Air Portugal | Too big | Too big |
| Transavia | Too big | Too big |
| Turkish Airlines | Too big | Too big |
| United Airlines | Too big | Too big |
| Viva Aerobus | Too tall (10.5" > 8.3") | Too big |
| Volaris | Too big | Too big |
| Vueling | Too tall (10.5" > 8.3") | Too big |
| WestJet | Too big | Too big |
19 airlines where size doesn't decide it (no pets in the cabin, or no published size)
| Aer Lingus | No cabin pets | No cabin pets |
| Aeroméxico | Size not published | Size not published |
| Air New Zealand | No cabin pets | No cabin pets |
| ANA (All Nippon Airways) | No cabin pets | No cabin pets |
| British Airways | No cabin pets | No cabin pets |
| Cathay Pacific | No cabin pets | No cabin pets |
| China Airlines | No cabin pets | No cabin pets |
| Croatia Airlines | Size not published | Size not published |
| easyJet | No cabin pets | No cabin pets |
| Emirates | No cabin pets | No cabin pets |
| Icelandair | No cabin pets | No cabin pets |
| Japan Airlines | No cabin pets | No cabin pets |
| Mokulele Airlines | Size not published | Size not published |
| Qantas | No cabin pets | No cabin pets |
| Qatar Airways | No cabin pets | No cabin pets |
| Ryanair | No cabin pets | No cabin pets |
| Singapore Airlines | No cabin pets | No cabin pets |
| Southern Airways Express | Size not published | Size not published |
| Virgin Atlantic | No cabin pets | No cabin pets |
Which should you buy?
The Diggs Passenger — it is within the published limit of 6 of the 58 airlines with a published cabin limit, against 2 for the SturdiBag Pro (Large, Flexible Height). That is the whole verdict on airline fit; real under-seat space still varies by aircraft and seat.
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Choose the Diggs Passenger if…
Diggs has discontinued this carrier. The Amazon link below goes to comparable carriers, not this exact bag.
- Structured, well-ventilated design. At 12" wide it is too wide for an 18 × 11 × 11 limit, and its 10.5" height rules out the 8.5" airlines.
- It clears 6 of 58 airlines with a published cabin limit outright — more than the SturdiBag Pro (Large, Flexible Height).
- Diggs publishes no pet-size limit for this one — measure your pet and compare against the interior before you choose. How →
Choose the SturdiBag Pro (Large, Flexible Height) if…
- The flexible-height top compresses to slide under lower seats, then springs back. That only helps with height: at 18" long and 11.5" wide it is still too big for 8.5" airlines like JetBlue and WestJet, so check the table below before you buy.
- It clears 2 of 58 airlines with a published cabin limit outright.
- SturdiBag publishes no pet-size limit for this one — measure your pet and compare against the interior before you choose. How →
No new copies on Amazon right nowIn stock and fits the same airlines: Mr. Peanut's Gold Series Mini (Low-Profile) on Amazon →
Full profiles: Diggs Passenger · SturdiBag Pro (Large, Flexible Height) · best carriers ranked · all carriers
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Common questions
Which fits more airlines, the Diggs Passenger or the SturdiBag Pro (Large, Flexible Height)?
The Diggs Passenger — it's within the published limit of 6 of the 58 airlines with a published cabin limit, against 2 for the other. Real under-seat space still varies by aircraft.
What's the size difference?
Diggs Passenger: 17 × 12 × 10.5 in. SturdiBag Pro (Large, Flexible Height): 18 × 11.5 × 11.5 in. Height is the strict dimension under a seat, and the Diggs Passenger is the shorter of the two.
Are these figures measured or published?
Published — both sets of dimensions come from the manufacturers' product pages (linked on each carrier's profile), matched against each airline's official carrier limit. We don't invent measurements.