Does the Sherpa Original Deluxe (Medium) fit Southwest Airlines?

No — the Sherpa Original Deluxe (Medium) (17 × 11 × 10.5 in) does not fit Southwest Airlines's 18 × 10.5 × 10 in under-seat limit.

17 × 11 × 10.5 in external · up to ~16 lb

Too big against Southwest Airlines's 18 × 10.5 × 10 in limit

See on Amazon →

Affiliate link — we may earn a small commission at no extra cost to you. It never changes our specs or which carriers we list.

17 × 11 × 10.5 in is over the 18 × 10.5 × 10 in limit.

Last verified 2026-09-24 · matched to the published Southwest Airlines limit. Every fit is against the published maximum; real under-seat space varies by aircraft (why).

Full Southwest Airlines shortlist: all carriers that fit Southwest Airlines → · this carrier on other airlines: Sherpa Original Deluxe (Medium) specs → · Southwest Airlines rules & fees: Southwest Airlines pet policy →