Published soft-sided in-cabin carrier limit: 18 × 12 × 11 in · hard-sided: 17 × 11 × 10.5 in. Cabin Pet Fit compares tracked carrier dimensions against this cited rule and keeps the caveats visible.
Rule snapshot
Published rule
A soft-sided carrier may be no larger than 18" L x 12" W x 11" H when fully closed. A hard-sided carrier may be no larger than 17" L x 11" W x 10.5" H when fully closed.
Source box
Accessed 2026-07-10. Review status: approved. Rule reviewed 2026-07-10. Cabin Pet Fit is not affiliated with Allegiant Air.
Recommendations
Shown only when the airline limit is public-ready. Each card keeps the reason, the fit gauge, and the evidence note together.
Sherpa Original Deluxe Carrier (Medium) is included because its listed dimensions (17 × 11 × 10.5 in) compare within this airline’s published in-cabin carrier limit. It also covers the neutral preference lane.
Generated from product dimension source and airline rule source in the fit matrix. This is not a fit guarantee.
Sleepypod Atom Carrier is included because its listed dimensions (17 × 8.5 × 10.5 in) compare within this airline’s published in-cabin carrier limit. It also covers the neutral preference lane.
Generated from product dimension source and airline rule source in the fit matrix. This is not a fit guarantee.
Wild One Travel Carrier is included because its listed dimensions (17.5 × 11 × 10 in) compare within this airline’s published in-cabin carrier limit. It also covers the neutral preference lane.
Generated from product dimension source and airline rule source in the fit matrix. This is not a fit guarantee.
EliteField 3-Door Soft-Sided Carrier (Medium) is included because its listed dimensions (17 × 9 × 12 in) compare within this airline’s published in-cabin carrier limit. It also covers the neutral preference lane.
Generated from product dimension source and airline rule source in the fit matrix. This is not a fit guarantee.
Amazon Basics Soft-Sided Mesh Carrier (Medium) is included because its listed dimensions (16.5 × 10.6 × 11 in) compare within this airline’s published in-cabin carrier limit. It also covers the neutral preference lane.
Generated from product dimension source and airline rule source in the fit matrix. This is not a fit guarantee.
Fit matrix
| Carrier | Listed dimensions | Status | Caveat |
|---|---|---|---|
| Sherpa Original Deluxe Carrier (Medium) | 17 × 11 × 10.5 in | Matches published limit | Published carrier dimensions fit within the airline's soft-sided limit; airport acceptance is not guaranteed. Soft-sided carriers can compress to help borderline fit. |
| Sherpa Forma Frame Carrier (Medium) | 19.7 × 9.8 × 9.8 in | Exceeds limit | Published carrier dimensions exceed the airline's soft-sided limit. |
| Petmate E-Z Load Two Door Kennel (19 in) | 19 × 10 × 7.5 in | Exceeds limit | Published carrier dimensions exceed the airline's hard-sided limit. |
| Sleepypod Air In-Cabin Carrier | 22 × 10.5 × 10.5 in | Exceeds limit | Published carrier dimensions exceed the airline's soft-sided limit. |
| Sleepypod Atom Carrier | 17 × 8.5 × 10.5 in | Matches published limit | Published carrier dimensions fit within the airline's soft-sided limit; airport acceptance is not guaranteed. Soft-sided carriers can compress to help borderline fit. |
| Away The Pet Carrier | 18.7 × 10.8 × 10.75 in | Tight / risky | One or more dimensions are close to or over the airline's soft-sided limit; soft-sided compression and under-seat variation by aircraft may matter. |
| Wild One Travel Carrier | 17.5 × 11 × 10 in | Matches published limit | Published carrier dimensions fit within the airline's soft-sided limit; airport acceptance is not guaranteed. Soft-sided carriers can compress to help borderline fit. |
| Mr. Peanut's Aspen Series Backpack Carrier | 18 × 14 × 9 in | Tight / risky | One or more dimensions are close to or over the airline's soft-sided limit; soft-sided compression and under-seat variation by aircraft may matter. |
| Mr. Peanut's Tahoe Series Expandable Backpack Carrier | 17 × 14.4 × 9 in | Tight / risky | One or more dimensions are close to or over the airline's soft-sided limit; soft-sided compression and under-seat variation by aircraft may matter. |
| Roverlund Out-of-Office Carrier (Large) | 18 × 11.5 × 11.5 in | Exceeds limit | Published carrier dimensions exceed the airline's soft-sided limit. |
| Sturdi SturdiBag Pro 2.0 (Large) | 18 × 11.5 × 11.5 in | Exceeds limit | Published carrier dimensions exceed the airline's soft-sided limit. |
| EliteField 3-Door Soft-Sided Carrier (Medium) | 17 × 9 × 12 in | Matches published limit | Published carrier dimensions fit within the airline's soft-sided limit; airport acceptance is not guaranteed. Soft-sided carriers can compress to help borderline fit. |
| Amazon Basics Soft-Sided Mesh Carrier (Medium) | 16.5 × 10.6 × 11 in | Matches published limit | Published carrier dimensions fit within the airline's soft-sided limit; airport acceptance is not guaranteed. Soft-sided carriers can compress to help borderline fit. |
| Henkelion Soft-Sided Collapsible Carrier (Small/Medium) | 17 × 11 × 11 in | Matches published limit | Published carrier dimensions fit within the airline's soft-sided limit; airport acceptance is not guaranteed. Soft-sided carriers can compress to help borderline fit. |
Allegiant Air's cited pet policy lists a soft-sided in-cabin carrier limit of 18 × 12 × 11 in (hard-sided: 17 × 11 × 10.5 in) as of 2026-07-10. Cabin Pet Fit compares carrier dimensions against that published limit; gate acceptance is not guaranteed.
The cited record lists $50 each way per carrier per segment. Fees change; always confirm on the airline's official pet page before you book.
No. A match means the carrier’s listed external dimensions compare inside the published limit. Gate agents, aircraft under-seat space, a rigid frame, and how full the carrier is can still affect real-world fit. We also do not advise on your pet’s health or fitness to fly.
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