United personal item

United’s personal item is 9 × 10 × 17 in (22 × 25 × 43 cm). It must fit under the seat and is free on every fare. On most Basic Economy tickets this is the only free cabin bag — no free overhead carry-on (exceptions: SAM / transatlantic / transpacific). If it does not fit under the seat on BE, gate check is $75 for tickets on/after Apr 3, 2026.

Personal item: always free if it meets 9 × 10 × 17 in (22 × 25 × 43 cm) and fits under the seat.

Full carry-on: free on most Economy and above; paid / blocked on most Basic Economy (exceptions: SAM / AT / Pacific; Canada tickets before 5/28/2025). Premier / eligible MileagePlus card / Star Alliance Gold may restore one free BE carry-on — confirm the card; Gateway & MileagePlus Select do not qualify for the BE carry-on benefit.

Checked bags: domestic prepaid/standard ladder and overweight/oversize add-ons live on United baggage fees. Military and status waivers are documented there — do not invent piece counts here.

Jacket / umbrella: free extras that do not count as a second personal item.

• Soft bags that expand past 9 × 10 × 17 fail under-seat fit and airport sizers.
• BE + failed personal item = $75, not a free gate-check, for tickets on/after Apr 3, 2026 (legacy pre–Apr 3 used a lower gate tier — mention only as history).
• Do not confuse personal 9×10×17 with carry-on 9×14×22 — on most domestic Basic Economy you only get the smaller free bag.
• United publishes personal-item dims; Delta often does not publish L×W×H for personal item — use that as a clarity win, not as invented Delta numbers.
• United Express CommutAir: personal item only onboard — even some non-BE itineraries may restrict the larger cabin bag on that operator.
• Card / Premier BE carry-on restore: confirm current card terms rather than assuming a full co-brand matrix.

1. Pack only a true under-seat bag on Basic Economy.
2. Measure the packed bag (not empty marketing size); aim ≤ 9 × 10 × 17 in.
3. If you need overhead space on domestic, skip BE, upgrade, or use Premier / an eligible card (confirm current terms).
4. If you must check: prepaid $45 beats gate $75 (Apr 3, 2026+ tickets).
5. Don’t wait until the gate to discover the bag won’t fit — compare fares with Delta Basic, which still includes a free carry-on, when overhead space matters.

Soft picks for under-seat / United personal-item size. Prefer non-expanding backpacks and totes marketed at or under 9 × 10 × 17 in (or “17×10×9”). Measure when packed.

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AmazonCard — Under-seat backpack (≤9×10×17 / “17×10×9”)
Daypack or personal-item backpack marketed for airline under-seat use. Confirm listed exterior dimensions stay within United’s 9 × 10 × 17 in (22 × 25 × 43 cm) when packed — this is often your only free cabin bag on Basic Economy.

AmazonCard — Slim personal-item tote / laptop bag
Structured tote or slim laptop shoulder bag aimed at under-seat fit. Useful when you want a purse-style personal item that still clears United’s published size without expanding in the bin-sizer zone.

When a dedicated BagRule guide goes live, start at /guides/best-personal-item-bag/ — until then, filter for ≤9×10×17 in and verify yourself.

What is the United personal item size?

9 × 10 × 17 inches (22 × 25 × 43 cm). Must fit under the seat. Same footprint as “17×10×9” in many searches.

Is a personal item free on United Basic Economy?

Yes — and on most Basic Economy flights it is the only free cabin bag (no free overhead carry-on except SAM / AT / Pacific, plus Canada tickets bought before 5/28/2025).

What if my personal item doesn’t fit under the seat on United?

Expect to check it. On Basic Economy, gate check is $75 for tickets purchased on/after Apr 3, 2026. Prepaid check earlier is cheaper ($45 on the domestic sample).

Does United allow a backpack as a personal item?

Yes if it fits 9 × 10 × 17 under the seat when packed. Official examples include backpacks and laptop bags.

What’s the difference between United personal item and carry-on?

Personal: 9 × 10 × 17, free, under seat. Carry-on: 9 × 14 × 22 (23 × 35 × 56 cm), overhead — free on most fares, not free on most Basic Economy. Full carry-on detail: United carry-on size.

Do Delta and Frontier personal-item rules differ?

United publishes explicit 9 × 10 × 17. Delta stresses under-seat fit (often no published L×W×H — confirm on the Delta personal item sibling). Frontier: 18 × 14 × 8, free on all fares including Basic, but Frontier Basic also lacks a free full carry-on. Biggest contrast for shoppers: United BE = personal only vs Delta BE = carry-on included.

Confirm sizes and fees on united.com before travel. BagRule is not affiliated with United Airlines.