Does the Mr. Peanut's Gold Series Standard (Expandable) fit United Airlines?
Yes — the Mr. Peanut's Gold Series Standard (Expandable) (18 × 11 × 10 in) fits United Airlines's 18 × 11 × 11 in under-seat limit, with 0" to spare on its tightest dimension.
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18 × 11 × 10 in is within 18 × 11 × 11 in — 0" spare on length, 0" on width, 1" on height. Tightest margin is 0", so measure before you fly.
Last verified 2026-09-23 · matched to the published United Airlines limit. Every fit is against the published maximum; real under-seat space varies by aircraft (why).
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