Sleepypod Atom — dimensions & which airlines it fits
Sleepypod Atom: 17 × 8.5 × 10.5 in external, up to ~12 lb. Compact, narrow (8.5" wide) soft carrier — crash-tested; the slim footprint helps on tighter aircraft, though its 10.5" height still needs an 11" airline.
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Specs
| External size (L×W×H) | 17 × 8.5 × 10.5 in |
| Type | soft-sided |
| Pet weight | up to ~12 lb |
Dimensions from the manufacturer product page · verified 2026-07-23
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Which airlines does the Sleepypod Atom 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 × 8.5 × 10.5 in is within 18 × 11 × 11 in — 1" spare on length, 2.5" on width, 0.5" on height. Tightest margin is 0.5", so measure before you fly. |
| American Airlines | 18 × 11 × 11 in | Fits 17 × 8.5 × 10.5 in is within 18 × 11 × 11 in — 1" spare on length, 2.5" on width, 0.5" on height. Tightest margin is 0.5", so measure before you fly. |
| United Airlines | 18 × 11 × 11 in | Fits 17 × 8.5 × 10.5 in is within 18 × 11 × 11 in — 1" spare on length, 2.5" on width, 0.5" on height. Tightest margin is 0.5", so measure before you fly. |
| Frontier Airlines | 18 × 14 × 11 in | Fits 17 × 8.5 × 10.5 in is within 18 × 14 × 11 in — 1" spare on length, 5.5" on width, 0.5" on height. Tightest margin is 0.5", so measure before you fly. |
| Allegiant Air | 18 × 12 × 11 in | Fits 17 × 8.5 × 10.5 in is within 18 × 12 × 11 in — 1" spare on length, 3.5" 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 × 8.5 × 10.5 in is within 21.5 × 15.5 × 10.5 in — 4.5" spare on length, 7" on width, 0" on height. Tightest margin is 0", so measure before you fly. |
| Avelo Airlines | 17 × 9 × 13 in | Fits 17 × 8.5 × 10.5 in is within 17 × 9 × 13 in — 0" spare on length, 0.5" on width, 2.5" on height. Tightest margin is 0", so measure before you fly. |
| JSX | 17 × 13 × 11 in | Fits 17 × 8.5 × 10.5 in is within 17 × 13 × 11 in — 0" spare on length, 4.5" on width, 0.5" on height. Tightest margin is 0", so measure before you fly. |
| JetBlue | 17 × 12.5 × 8.5 in | Too tall (10.5" > 8.5") 10.5" tall exceeds the 8.5" limit by 2" and this carrier doesn't compress. |
| Southwest Airlines | 18.5 × 13.5 × 8.5 in | Too tall (10.5" > 8.5") 10.5" tall exceeds the 8.5" limit by 2" and this carrier doesn't compress. |
| Alaska Airlines | 17 × 11 × 9.5 in | Too tall (10.5" > 9.5") 10.5" tall exceeds the 9.5" limit by 1" and this carrier doesn't compress. |
| Air Canada | 17 × 16 × 8 in | Too tall (10.5" > 8") 10.5" tall exceeds the 8" limit by 2.5" and this carrier doesn't compress. |
| Sun Country Airlines | 17 × 12 × 9 in | Too tall (10.5" > 9") 10.5" tall exceeds the 9" limit by 1.5" and this carrier doesn't compress. |
| Hawaiian Airlines | 17 × 11 × 9.5 in | Too tall (10.5" > 9.5") 10.5" tall exceeds the 9.5" limit by 1" and this carrier doesn't compress. |
| Air Transat | 17 × 9.5 × 10 in | Too tall (10.5" > 10") 10.5" tall exceeds the 10" limit by 0.5" and this carrier doesn't compress. |
| Breeze Airways | 17 × 8 × 13 in | Too big 17 × 8.5 × 10.5 in is over the 17 × 8 × 13 in limit. |
| WestJet | 16 × 10 × 8.5 in | Too big 17 × 8.5 × 10.5 in is over the 16 × 10 × 8.5 in limit. |
Compared with
Sleepypod Atom vs Sleepypod Air Sleepypod Atom vs Mr. Peanut's Gold Series Mini (Low-Profile)
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 Sleepypod Atom?
Its published external size is 17 × 8.5 × 10.5 in, rated for up to ~12 lb. Source: the manufacturer's product page.
Which airlines does the Sleepypod Atom fit?
Against published limits it fits Delta Air Lines, American Airlines, United Airlines, Frontier Airlines, Allegiant Air, Porter Airlines, Avelo Airlines, JSX. Real under-seat space varies by aircraft, so confirm for your flight.