Mr. Peanut's Gold Series Standard (Expandable) — dimensions & which airlines it fits
Mr. Peanut's Gold Series Standard (Expandable): 18.5 × 11.75 × 11.5 in external. Flex height plus side expansion. At 18.5" long / 11.5" tall it's a big-carrier — best on the 11" airlines.
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Specs
| External size (L×W×H) | 18.5 × 11.75 × 11.5 in |
| Type | soft-sided · flexible height · expandable at the gate |
Dimensions from the manufacturer product page · verified 2026-07-23
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Which airlines does the Mr. Peanut's Gold Series Standard (Expandable) 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 |
|---|---|---|
| Southwest Airlines | 18.5 × 13.5 × 8.5 in | Flexes — check height 11.5" tall vs a 8.5" limit — 3" over, but the flexible-height top compresses down. Verify it squeezes under your actual seat. |
| Porter Airlines | 21.5 × 15.5 × 10.5 in | Flexes — check height 11.5" tall vs a 10.5" limit — 1" over, but the flexible-height top compresses down. Verify it squeezes under your actual seat. |
| Delta Air Lines | 18 × 11 × 11 in | Too big 18.5 × 11.75 × 11.5 in is over the 18 × 11 × 11 in limit. |
| JetBlue | 17 × 12.5 × 8.5 in | Too big 18.5 × 11.75 × 11.5 in is over the 17 × 12.5 × 8.5 in limit. |
| American Airlines | 18 × 11 × 11 in | Too big 18.5 × 11.75 × 11.5 in is over the 18 × 11 × 11 in limit. |
| United Airlines | 18 × 11 × 11 in | Too big 18.5 × 11.75 × 11.5 in is over the 18 × 11 × 11 in limit. |
| Alaska Airlines | 17 × 11 × 9.5 in | Too big 18.5 × 11.75 × 11.5 in is over the 17 × 11 × 9.5 in limit. |
| Frontier Airlines | 18 × 14 × 11 in | Too big 18.5 × 11.75 × 11.5 in is over the 18 × 14 × 11 in limit. |
| Air Canada | 17 × 16 × 8 in | Too big 18.5 × 11.75 × 11.5 in is over the 17 × 16 × 8 in limit. |
| Allegiant Air | 18 × 12 × 11 in | Too big 18.5 × 11.75 × 11.5 in is over the 18 × 12 × 11 in limit. |
| Sun Country Airlines | 17 × 12 × 9 in | Too big 18.5 × 11.75 × 11.5 in is over the 17 × 12 × 9 in limit. |
| Hawaiian Airlines | 17 × 11 × 9.5 in | Too big 18.5 × 11.75 × 11.5 in is over the 17 × 11 × 9.5 in limit. |
| Breeze Airways | 17 × 8 × 13 in | Too big 18.5 × 11.75 × 11.5 in is over the 17 × 8 × 13 in limit. |
| WestJet | 16 × 10 × 8.5 in | Too big 18.5 × 11.75 × 11.5 in is over the 16 × 10 × 8.5 in limit. |
| Avelo Airlines | 17 × 9 × 13 in | Too big 18.5 × 11.75 × 11.5 in is over the 17 × 9 × 13 in limit. |
| Air Transat | 17 × 9.5 × 10 in | Too big 18.5 × 11.75 × 11.5 in is over the 17 × 9.5 × 10 in limit. |
| JSX | 17 × 13 × 11 in | Too big 18.5 × 11.75 × 11.5 in is over the 17 × 13 × 11 in limit. |
Compared with
Mr. Peanut's Gold Series Standard (Expandable) 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 Mr. Peanut's Gold Series Standard (Expandable)?
Its published external size is 18.5 × 11.75 × 11.5 in. Source: the manufacturer's product page.
Which airlines does the Mr. Peanut's Gold Series Standard (Expandable) fit?
Against published limits it fits Southwest Airlines, Porter Airlines. Real under-seat space varies by aircraft, so confirm for your flight.