In-cabin pet carriers that fit Brussels Airlines
The carriers from our list that clear Brussels Airlines' official 21.7 × 15.7 × 9.1 in under-seat limit — sorted best-fit first, with the ones that squeeze in when collapsed flagged.
Short answer: 6 of the 15 carriers we track fit Brussels Airlines' 21.7 × 15.7 × 9.1 in limit: 2 with room to spare on every side and 4 only when collapsed or squeezed a little. 9 are too big.
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| Carrier | Size | Fit | Buy |
|---|---|---|---|
 Sherpa Original Deluxe (Small) up to ~8 lb · max pet 13″ long × 7.5″ tall 15 × 10 × 8.5 in is within 21.7 × 15.7 × 9.1 in — 6.7" spare on length, 5.7" on width, 0.6" on height. · collapsible/flex | 15 × 10 × 8.5 in | Fits | See on Amazon → |
Mr. Peanut's Gold Series Mini (Low-Profile) up to ~15 lb · over Brussels Airlines's 17.6 lb limit once the bag is counted 17 × 11 × 9 in is within 21.7 × 15.7 × 9.1 in — 4.7" spare on length, 4.7" on width, 0.1" on height. Tightest margin is 0.1", so measure before you fly. · collapsible/flex | 17 × 11 × 9 in | Fits | Not available on Amazon right now |
Mr. Peanut's Gold Series Standard (Expandable) up to ~20 lb · over Brussels Airlines's 17.6 lb limit once the bag is counted 10" tall vs a 9.1" limit — 0.9" over, but the flexible-height top compresses down. Verify it squeezes under your actual seat. · collapsible/flex | 18 × 11 × 10 in | Flexes — 0.9" over | Not available on Amazon right nowIn stock and fits the same airlines: Petmate Soft-Sided Kennel Cab (Medium) |
Sherpa Original Deluxe (Medium) up to ~16 lb · max pet 16″ long × 9.5″ tall · over Brussels Airlines's 17.6 lb limit once the bag is counted 10.5" tall vs a 9.1" limit — 1.4" over, but the flexible-height top compresses down. Verify it squeezes under your actual seat. · collapsible/flex | 17 × 11 × 10.5 in | Flexes — 1.4" over | See on Amazon → |
Sherpa Original Deluxe (Large) up to ~22 lb · max pet 18″ long × 10.5″ tall · over Brussels Airlines's 17.6 lb limit once the bag is counted 11.5" tall vs a 9.1" limit — 2.4" over, but the flexible-height top compresses down. Verify it squeezes under your actual seat. · collapsible/flex | 19 × 11.75 × 11.5 in | Flexes — 2.4" over | See on Amazon → |
SturdiBag Pro (Large, Flexible Height) pet size not published 11.5" tall vs a 9.1" limit — 2.4" over, but the flexible-height top compresses down. Verify it squeezes under your actual seat. · collapsible/flex | 18 × 11.5 × 11.5 in | Flexes — 2.4" over | Not available on Amazon right nowIn stock and fits the same airlines: Petmate Soft-Sided Kennel Cab (Medium) |
Every fit is against the published maximum; real under-seat space varies by aircraft (why). Full rules & fees: Brussels Airlines pet policy → · how Brussels Airlines ranks on fee and space →
Other airlines: Cape Air · Condor · Contour Airlines · Copa Airlines · Croatia Airlines · Delta Air Lines
Common questions
What size pet carrier does Brussels Airlines allow in the cabin?
Brussels Airlines' published limit for a carrier under the seat in front of you is 21.7 × 15.7 × 9.1 in. The carrier must be soft-sided. Weight limit: 8 kg (17.6 lb) including the transport bag. We last checked this against Brussels Airlines' own pet policy on 2026-08-25.
How many pet carriers fit Brussels Airlines' limit?
6 of the 15 carriers we track fit Brussels Airlines' 21.7 × 15.7 × 9.1 in limit: 2 with room to spare on every side and 4 only when collapsed or squeezed a little. 9 are too big.
Which carriers only fit Brussels Airlines when collapsed or squeezed?
Mr. Peanut's Gold Series Standard (Expandable), Sherpa Original Deluxe (Medium), Sherpa Original Deluxe (Large), SturdiBag Pro (Large, Flexible Height). Each is over the published size until folded or pressed down, so measure yours and expect it may be checked at the gate.
Which carriers are too big for Brussels Airlines?
Petmate Soft-Sided Kennel Cab (Medium), Diggs Passenger, ibiyaya JetPaw Expandable Backpack, Sleepypod Atom, Away The Pet Carrier, Petsfit (Medium) Expandable Soft-Sided, Bergan Comfort Carrier (Small), Frisco Premium Airline-Compliant Carrier, Sleepypod Air. Each is over the 21.7 × 15.7 × 9.1 in limit.
How much does Brussels Airlines charge for a pet in the cabin?
An additional fee applies per flight, purchased when booking; Brussels Airlines publishes no single figure and carriage is subject to availability. Confirm the current fee with Brussels Airlines when you book.
How do I book a pet in the cabin on Brussels Airlines?
Book in advance online via "My booking" or through the Brussels Airlines Service Centre — subject to availability. Last checked 2026-08-25.