Sherpa Original Deluxe (Small) — dimensions & which airlines it fits
Sherpa Original Deluxe (Small): 15 × 10 × 8.5 in external, up to ~8 lb. Naturally short (8.5") and soft — one of the few that already clears the 8.5" airlines (Southwest, JetBlue). Part of Sherpa's Guaranteed On Board® program.
Affiliate link — we may earn a small commission at no extra cost to you.
Specs
| External size (L×W×H) | 15 × 10 × 8.5 in |
| Type | soft-sided · flexible height |
| Pet weight | up to ~8 lb |
Dimensions from the manufacturer product page · verified 2026-07-23
Affiliate link — we may earn a small commission at no extra cost to you. It never changes our specs or which carriers we list.
Which airlines does the Sherpa Original Deluxe (Small) 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 15 × 10 × 8.5 in is within 18 × 11 × 11 in — 3" spare on length, 1" on width, 2.5" on height. |
| JetBlue | 17 × 12.5 × 8.5 in | Fits 15 × 10 × 8.5 in is within 17 × 12.5 × 8.5 in — 2" spare on length, 2.5" on width, 0" on height. Tightest margin is 0", so measure before you fly. |
| American Airlines | 18 × 11 × 11 in | Fits 15 × 10 × 8.5 in is within 18 × 11 × 11 in — 3" spare on length, 1" on width, 2.5" on height. |
| United Airlines | 18 × 11 × 11 in | Fits 15 × 10 × 8.5 in is within 18 × 11 × 11 in — 3" spare on length, 1" on width, 2.5" on height. |
| Southwest Airlines | 18.5 × 13.5 × 8.5 in | Fits 15 × 10 × 8.5 in is within 18.5 × 13.5 × 8.5 in — 3.5" spare on length, 3.5" on width, 0" on height. Tightest margin is 0", so measure before you fly. |
| Alaska Airlines | 17 × 11 × 9.5 in | Fits 15 × 10 × 8.5 in is within 17 × 11 × 9.5 in — 2" spare on length, 1" on width, 1" on height. |
| Frontier Airlines | 18 × 14 × 11 in | Fits 15 × 10 × 8.5 in is within 18 × 14 × 11 in — 3" spare on length, 4" on width, 2.5" on height. |
| Allegiant Air | 18 × 12 × 11 in | Fits 15 × 10 × 8.5 in is within 18 × 12 × 11 in — 3" spare on length, 2" on width, 2.5" on height. |
| Sun Country Airlines | 17 × 12 × 9 in | Fits 15 × 10 × 8.5 in is within 17 × 12 × 9 in — 2" spare on length, 2" on width, 0.5" on height. Tightest margin is 0.5", so measure before you fly. |
| Hawaiian Airlines | 17 × 11 × 9.5 in | Fits 15 × 10 × 8.5 in is within 17 × 11 × 9.5 in — 2" spare on length, 1" on width, 1" on height. |
| WestJet | 16 × 10 × 8.5 in | Fits 15 × 10 × 8.5 in is within 16 × 10 × 8.5 in — 1" spare on length, 0" on width, 0" on height. Tightest margin is 0", so measure before you fly. |
| Porter Airlines | 21.5 × 15.5 × 10.5 in | Fits 15 × 10 × 8.5 in is within 21.5 × 15.5 × 10.5 in — 6.5" spare on length, 5.5" on width, 2" on height. |
| JSX | 17 × 13 × 11 in | Fits 15 × 10 × 8.5 in is within 17 × 13 × 11 in — 2" spare on length, 3" on width, 2.5" on height. |
| Air Canada | 17 × 16 × 8 in | Flexes — check height 8.5" tall vs a 8" limit — 0.5" over, but the flexible-height top compresses down. Verify it squeezes under your actual seat. |
| Breeze Airways | 17 × 8 × 13 in | Too big 15 × 10 × 8.5 in is over the 17 × 8 × 13 in limit. |
| Avelo Airlines | 17 × 9 × 13 in | Too big 15 × 10 × 8.5 in is over the 17 × 9 × 13 in limit. |
| Air Transat | 17 × 9.5 × 10 in | Too big 15 × 10 × 8.5 in is over the 17 × 9.5 × 10 in limit. |
Compared with
Sherpa Original Deluxe (Small) vs Sherpa Original Deluxe (Medium)
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 (Small)?
Its published external size is 15 × 10 × 8.5 in, rated for up to ~8 lb. Source: the manufacturer's product page.
Which airlines does the Sherpa Original Deluxe (Small) fit?
Against published limits it fits Delta Air Lines, JetBlue, American Airlines, United Airlines, Southwest Airlines, Alaska Airlines, Frontier Airlines, Allegiant Air, Sun Country Airlines, Hawaiian Airlines, WestJet, Porter Airlines, JSX, Air Canada. Real under-seat space varies by aircraft, so confirm for your flight.