Petmate Soft-Sided Kennel Cab (Small) vs Sherpa Original Deluxe (Medium): which airline pet carrier?
Two of the most cross-shopped in-cabin carriers, compared the way an airline sees them: by published size against each under-seat limit. Petmate Soft-Sided Kennel Cab (Small) is 17 × 10 × 10 in; Sherpa Original Deluxe (Medium) is 17 × 11 × 10.5 in.
Side by side
| Property | Petmate Soft-Sided Kennel Cab (Small) | Sherpa Original Deluxe (Medium) |
|---|---|---|
| External size (L×W×H) | 17 × 10 × 10 in | 17 × 11 × 10.5 in |
| Type | soft-sided | soft-sided · flexible height |
| Pet weight | up to ~10 lb | up to ~16 lb |
| Airlines it fits outright | 5 of 12 | 5 of 12 |
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.
| Airline | Soft-Sided Kennel Cab (Small) | Original Deluxe (Medium) |
|---|---|---|
| Delta Air Lines | Fits | Fits |
| JetBlue | Too tall (10" > 8.5") | Flexes — check height |
| American Airlines | Fits | Fits |
| United Airlines | Fits | Fits |
| Southwest Airlines | Too tall (10" > 8.5") | Flexes — check height |
| Alaska Airlines | Too tall (10" > 9.5") | Flexes — check height |
| Frontier Airlines | Fits | Fits |
| Air Canada | Too tall (10" > 8") | Flexes — check height |
| Allegiant Air | Fits | Fits |
| Sun Country Airlines | Too tall (10" > 9") | Flexes — check height |
| Hawaiian Airlines | Too tall (10" > 9.5") | Flexes — check height |
| Breeze Airways | Too big | Too big |
⚠️ "Fits" means within the published maximum — real under-seat space varies by aircraft and seat. See why →
Choose the Petmate Soft-Sided Kennel Cab (Small) if…
- Budget soft carrier with two easy-open doors; 17×10×10 fits the 18×11×11 airlines and its 10" height clears more foot-wells than the 11" models.
- It clears 5 of 12 tracked airlines outright.
- Your pet is under ~10 lb.
Choose the Sherpa Original Deluxe (Medium) if…
- Spring-wire top flexes down to squeeze under lower seats. Guaranteed On Board®.
- It clears 5 of 12 tracked airlines outright.
- Your pet is under ~16 lb.
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Full profiles: Petmate Soft-Sided Kennel Cab (Small) · Sherpa Original Deluxe (Medium) · best carriers ranked · all carriers