Best airline-approved soft pet carriers: sizes vs. under-seat limits
✓ Product dimensions checked against each manufacturer's official page; airline limits from our dated airline pages.
How we rank: by the number of airline cabin carrier limits (out of 11 on our airline pages) that each size fits within on published dimensions alone. It is not a quality rating, and we have not tested these carriers.
| Carrier & size | Dimensions (L × W × H) | Limits fitted | Airlines |
|---|---|---|---|
| Sherpa Original Deluxe Pet Carrier – Small | 15 × 10 × 8.5 in (38 × 25 × 22 cm) | 9 of 11 | Air Canada, Air France, Alaska Airlines (and Hawaiian Airlines), American Airlines, Delta Air Lines, JetBlue, Lufthansa, United Airlines |
| SturdiBag Pro 3.0 Travel Pet Carrier – Small | 18 × 10 × 9.25 in (46 × 25 × 23 cm) | 6 of 11 | Air Canada, Air France, American Airlines, Delta Air Lines, United Airlines |
| Sherpa Original Deluxe Pet Carrier – Medium | 17 × 11 × 10.5 in (43 × 28 × 27 cm) | 4 of 11 | Air Canada, American Airlines, Delta Air Lines, United Airlines |
| Sleepypod Air | 16–22 × 10.5 × 10.5 in (41–56 × 27 × 27 cm) | 4 of 11 | Air Canada, American Airlines, Delta Air Lines, United Airlines |
| Sleepypod Atom | 17 × 8.5 × 10.5 in (43 × 22 × 27 cm) | 4 of 11 | Air Canada, American Airlines, Delta Air Lines, United Airlines |
| Sherpa Original Deluxe Pet Carrier – Large | 19 × 11.75 × 11.5 in (48 × 30 × 29 cm) | 0 of 11 | none |
| Sleepypod Mini | 13 × 13 × 11 in (33 × 33 × 28 cm) | 0 of 11 | none |
| SturdiBag Pro 3.0 Travel Pet Carrier – Medium | 15 × 12 × 11.75 in (38 × 30 × 30 cm) | 0 of 11 | none |
| SturdiBag Pro 3.0 Travel Pet Carrier – Large | 18 × 11.5 × 11.5 in (46 × 29 × 29 cm) | 0 of 11 | none |
| SturdiBag Pro 3.0 Travel Pet Carrier – XL | 20 × 12 × 15 in (51 × 30 × 38 cm) | 0 of 11 | none |
| SturdiBag Pro 3.0 Travel Pet Carrier – XXL | 23 × 15 × 14 in (58 × 38 × 36 cm) | 0 of 11 | none |
"Within" includes carriers that only fit at their shortest adjustable length (Sleepypod Air). Soft-sided only on our pages: Air Canada, Air France, Alaska Airlines (and Hawaiian Airlines), Lufthansa; check each product page.
The carriers
Sherpa Original Deluxe Pet Carrier
Sherpa lists "Product Dimensions" without naming the axes; we read them as length x width x height. Sherpa says the patented spring wire frame lets the rear of the carrier be pushed down "several inches" to fit under airplane seats (no exact compressed height is published). Full airline fit table.
Sleepypod Air
Sleepypod lists the length as adjustable from 16 to 22 in (40.64 to 55.88 cm). Sleepypod says the design contracts in length to fit under a range of airline seats. Full airline fit table.
Sleepypod Atom
Exterior carrier dimensions as listed by Sleepypod (long x wide x tall). Interior: 16 x 8 x 9.5 in. Sleepypod lists a Center for Pet Safety certification for pets up to 12 lb and says it can be used as a car seat. Full airline fit table.
Sleepypod Mini
Round carrier: Sleepypod lists 13 in diameter and 11 in tall (bed + dome). We compare it as a 13 x 13 in footprint. Sleepypod says the Mini is "small enough to fit under an airline seat" and lists a Center for Pet Safety certification for pets up to 7 lb. Full airline fit table.
SturdiBag Pro 3.0 Travel Pet Carrier
Sturdi lists depth (D) x width (W) x height (H); we treat depth as length. Sturdi says the carrier is airline compliant for in-cabin travel on most major airlines, excluding the XL and XXL sizes. Full airline fit table.
More guides
- Pet carrier size limits by airline (under-seat) and carriers that fit
- IATA-style hard crates for flying pets in the hold or as cargo
- Pet carrier backpacks for flying: do they fit under the seat?
- Travel water bowls for dogs and cats: collapsible and nesting options
- All pet travel products
Affiliate disclosure: some links on this page may be affiliate links; if you buy through them we may earn a commission at no extra cost to you. It never changes the dimensions or fit results shown. We have not tested these products ourselves: every figure comes from the linked manufacturer page. Disclosure.