Sherpa Original Deluxe (Medium) — dimensions & which airlines it fits
Sherpa Original Deluxe (Medium): 17 × 11 × 10.5 in external, up to ~16 lb. Spring-wire top flexes down to squeeze under lower seats. Guaranteed On Board®.
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Specs
| External size (L×W×H) | 17 × 11 × 10.5 in |
| Type | soft-sided · flexible height |
| Pet weight | up to ~16 lb |
Dimensions from the manufacturer product page · verified 2026-07-23
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Which airlines does the Sherpa Original Deluxe (Medium) fit?
Compared against each airline's published under-seat limit (height strict; footprint may rotate). Green = within the published size; amber = fits only when collapsed / flexed; grey = over.
| Airline | Its limit | This carrier |
|---|---|---|
| Delta Air Lines | 18 × 11 × 11 in | Fits 17 × 11 × 10.5 in is within 18 × 11 × 11 in — 1" spare on length, 0" on width, 0.5" on height. Tightest margin is 0", so measure before you fly. |
| American Airlines | 18 × 11 × 11 in | Fits 17 × 11 × 10.5 in is within 18 × 11 × 11 in — 1" spare on length, 0" on width, 0.5" on height. Tightest margin is 0", so measure before you fly. |
| United Airlines | 18 × 11 × 11 in | Fits 17 × 11 × 10.5 in is within 18 × 11 × 11 in — 1" spare on length, 0" on width, 0.5" on height. Tightest margin is 0", so measure before you fly. |
| Frontier Airlines | 18 × 14 × 11 in | Fits 17 × 11 × 10.5 in is within 18 × 14 × 11 in — 1" spare on length, 3" on width, 0.5" on height. Tightest margin is 0.5", so measure before you fly. |
| Allegiant Air | 18 × 12 × 11 in | Fits 17 × 11 × 10.5 in is within 18 × 12 × 11 in — 1" spare on length, 1" on width, 0.5" on height. Tightest margin is 0.5", so measure before you fly. |
| Porter Airlines | 21.5 × 15.5 × 10.5 in | Fits 17 × 11 × 10.5 in is within 21.5 × 15.5 × 10.5 in — 4.5" spare on length, 4.5" on width, 0" on height. Tightest margin is 0", so measure before you fly. |
| JSX | 17 × 13 × 11 in | Fits 17 × 11 × 10.5 in is within 17 × 13 × 11 in — 0" spare on length, 2" on width, 0.5" on height. Tightest margin is 0", so measure before you fly. |
| JetBlue | 17 × 12.5 × 8.5 in | Flexes — check height 10.5" tall vs a 8.5" limit — 2" over, but the flexible-height top compresses down. Verify it squeezes under your actual seat. |
| Southwest Airlines | 18.5 × 13.5 × 8.5 in | Flexes — check height 10.5" tall vs a 8.5" limit — 2" over, but the flexible-height top compresses down. Verify it squeezes under your actual seat. |
| Alaska Airlines | 17 × 11 × 9.5 in | Flexes — check height 10.5" tall vs a 9.5" limit — 1" over, but the flexible-height top compresses down. Verify it squeezes under your actual seat. |
| Air Canada | 17 × 16 × 8 in | Flexes — check height 10.5" tall vs a 8" limit — 2.5" over, but the flexible-height top compresses down. Verify it squeezes under your actual seat. |
| Sun Country Airlines | 17 × 12 × 9 in | Flexes — check height 10.5" tall vs a 9" limit — 1.5" over, but the flexible-height top compresses down. Verify it squeezes under your actual seat. |
| Hawaiian Airlines | 17 × 11 × 9.5 in | Flexes — check height 10.5" tall vs a 9.5" limit — 1" over, but the flexible-height top compresses down. Verify it squeezes under your actual seat. |
| Breeze Airways | 17 × 8 × 13 in | Too big 17 × 11 × 10.5 in is over the 17 × 8 × 13 in limit. |
| WestJet | 16 × 10 × 8.5 in | Too big 17 × 11 × 10.5 in is over the 16 × 10 × 8.5 in limit. |
| Avelo Airlines | 17 × 9 × 13 in | Too big 17 × 11 × 10.5 in is over the 17 × 9 × 13 in limit. |
| Air Transat | 17 × 9.5 × 10 in | Too big 17 × 11 × 10.5 in is over the 17 × 9.5 × 10 in limit. |
Compared with
Sherpa Original Deluxe (Medium) vs Sleepypod Air Sherpa Original Deluxe (Medium) vs Mr. Peanut's Gold Series Standard (Expandable) Sherpa Original Deluxe (Medium) vs Petsfit Expandable Soft-Sided Sherpa Original Deluxe (Medium) vs Sherpa Original Deluxe (Small) Sherpa Original Deluxe (Medium) vs Petmate Soft-Sided Kennel Cab (Small)
Not sure this is the one? See the best carriers ranked by how many airlines they fit · compare all: carriers · fit for a specific airline: Delta · JetBlue · American · United · Southwest
Common questions
What are the dimensions of the Sherpa Original Deluxe (Medium)?
Its published external size is 17 × 11 × 10.5 in, rated for up to ~16 lb. Source: the manufacturer's product page.
Which airlines does the Sherpa Original Deluxe (Medium) fit?
Against published limits it fits Delta Air Lines, American Airlines, United Airlines, Frontier Airlines, Allegiant Air, Porter Airlines, JSX, JetBlue, Southwest Airlines, Alaska Airlines, Air Canada, Sun Country Airlines, Hawaiian Airlines. Real under-seat space varies by aircraft, so confirm for your flight.