Personal Item Size — Rules by Airline (2026)
A personal item is a smaller bag that goes under the seat in front of you — every US airline allows one free of charge in addition to (or, on Basic Economy, instead of) a carry-on. Personal-item size limits vary from ~9 x 10 x 17 inches on United to a generous 22 x 18 x 10 on Spirit, so a backpack that clears one airline can be gate-checked on another. This guide shows the exact dimensions and weight limits for every major US carrier so you can pick a bag that fits everywhere you fly.
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What Counts as a Personal Item
A personal item is any bag small enough to fit fully under the seat in front of you. That's the practical test — the published dimensions are the airline's target for that under-seat space. Backpacks, tote bags, laptop bags, purses, small duffels, and camera bags all qualify as long as they meet the size limit. Musical instruments and mobility devices are separately regulated; car seats and strollers are usually free but not counted as your personal item. It's the airline's rule that governs your personal item, not the airport it operates from — a bag that clears the terminal fine at YVR or any other airport can still be gate-checked if it's oversize for that specific carrier. Train carriers like Via Rail run their own, typically more generous, carry-on policies that don't follow airline personal-item rules at all, so don't assume a bag sized for a flight is also the limiting factor on a train leg of the same trip.
- Under-seat fit is the real rule — dimensions are the guide
- Backpacks, totes, laptop bags, purses, small duffels all qualify
- Garment bags qualify if they fold or roll down to the size limit
- Hard-shell and roller personal items qualify too, as long as they fit under the seat with wheels included in the measurement
- Hiking backpacks qualify only if compact — most 30L+ packs are too tall for personal-item status
- Kids' luggage qualifies the same way — measure it packed, just like an adult's bag
- Musical instruments have separate policies (call ahead)
- Car seats and strollers are usually free but separate
Personal Item Size by Airline
Personal-item limits vary widely across US carriers. United's 9 x 10 x 17 inch limit is one of the strictest; Spirit's 18 x 14 x 8 is the most restrictive budget-carrier limit; Southwest and JetBlue are among the more generous. Weight limits are almost never enforced on personal items in the US, but international carriers (Ryanair, Wizz, Air New Zealand) do weigh them. The table below reflects the airlines' currently published rules — always verify at the airline's site before booking.
US personal-item size limits (as published, 2026)
| Airline | Max dimensions (inches) | Under-seat friendly | Weight limit |
|---|---|---|---|
| American | 18 x 14 x 8 | Yes | Not enforced |
| Delta | No specific size; must fit under seat | Yes | Not enforced |
| United | 9 x 10 x 17 | Yes (strict) | Not enforced |
| Southwest | 18.5 x 8.5 x 13.5 | Yes | Not enforced |
| JetBlue | 17 x 13 x 8 (Blue Basic: personal item only) | Yes | Not enforced |
| Alaska | No specific size; must fit under seat | Yes | Not enforced |
| Spirit | 18 x 14 x 8 | Yes | Not enforced (free with fare) |
| Frontier | 14 x 8 x 18 (fits under seat) | Yes | 35 lb combined w/ carry-on |
| Allegiant | 7 x 15 x 16 | Yes | Not enforced |
| Breeze | 17 x 13 x 8 | Yes | Not enforced |
Bottom line: A bag around 17 x 13 x 8 (or smaller) clears every US airline. A 40L travel backpack is almost always too large for personal-item status and must go in the overhead bin.
How to Measure a Personal Item Bag
Measure your bag fully packed, not empty — soft-sided bags expand when full and that's the shape the gate agent evaluates. Use a tape measure or a purpose-built luggage sizer. Include external pockets, wheels, and handles in each dimension; airlines measure the outermost points of the bag as it will be presented at the gate. If you'll fly multiple airlines with different limits, pick the strictest one you'll use as your target size.
- Measure fully packed — soft bags expand
- Include wheels, handles, pockets, and external attachments
- Airlines measure the outermost points, not the base dimensions
- Target the strictest limit you fly to build one bag for every trip
What Fits in a Personal Item (Real Loadouts)
A typical personal-item bag (17 x 13 x 8) holds a 15-inch laptop, a change of clothes, a toiletry kit (with a TSA 3-1-1 liquids bag), a small camera or e-reader, snacks, a water bottle, and headphones. For a weekend trip without a carry-on, aim for 20-25L of internal volume — that's enough for two days of clothing plus tech. For a week with a carry-on, the personal item is for tech, meds, valuables, and a change of clothes in case checked luggage is delayed. A small hardshell mini-suitcase (roughly 16-17 inches tall) can also work as a personal item if it stays within your airline's under-seat dimensions — just measure it the same way you would a backpack before relying on it.
- 17 x 13 x 8 holds ~18-25L internal volume
- Fits a 15-inch laptop, weekend clothes, toiletries, water bottle
- For weekends without a carry-on: aim for 20-25L soft-sided
- For a week with carry-on: use it for tech, meds, valuables
Personal Item vs. Carry-On — What's the Difference
A personal item goes under the seat in front of you; a carry-on goes in the overhead bin. Personal items are free on every US airline including Basic Economy fares. Carry-ons are free on most fares but banned on Basic Economy at United, American, and JetBlue's cheapest tier — bringing one anyway means a gate check fee of $50-100. When flying Basic Economy, size your bag as a personal item (17 x 13 x 8 or smaller) and you'll skip the fee entirely.
- Personal item = under-seat; carry-on = overhead bin
- Personal item is free on every fare, including Basic Economy
- Carry-on is banned on most Basic Economy fares (United, American, JetBlue Basic)
- Bag sized as a personal item skips the fee on any fare
International Carriers Have Different Rules
International low-cost carriers cap personal items much smaller than US airlines and actively enforce weight. Ryanair, Wizz Air, and easyJet each publish an exact small-bag limit, and several other European carriers — British Airways, Air France, KLM, Jet2, Norwegian, and Eurowings — publish their own specific personal-item dimensions too; all are listed in the table below with both cm and inches. Most full-service carriers outside Europe (the Gulf, Asian, and Oceania airlines) don't publish a separate personal-item spec at all — they set one combined cabin-bag allowance instead — and many North and Latin American carriers follow a policy similar in spirit to the US table above but with limits that shift by fare class. For carriers not given exact numbers in the table, confirm the current figure on the airline's own site before flying; weigh your bag ahead of time on any itinerary where the carrier does enforce weight, since oversize fees run €50-100 at the gate.
International personal-item size limits (as published, 2026)
| Airline | Max dimensions (cm) | Approx. inches | Weight limit |
|---|---|---|---|
| Ryanair | 40 x 20 x 25 | 16 x 8 x 10 | 10 kg (strict) |
| Wizz Air | 40 x 30 x 20 | 16 x 12 x 8 | Not strictly enforced |
| easyJet | 45 x 36 x 20 | 18 x 14 x 8 | Weighed at the gate |
| British Airways | 40 x 30 x 15 | 16 x 12 x 6 | Free, in addition to the 56 x 45 x 25 cm cabin bag |
| Air France | 40 x 30 x 15 | 16 x 12 x 6 | Free, in addition to cabin bag |
| KLM | 40 x 30 x 15 | 16 x 12 x 6 | Same policy as Air France (same group) |
| Jet2 | 40 x 30 x 20 | 16 x 12 x 8 | Free, separate from the paid larger cabin bag |
| Norwegian | 30 x 20 x 38 | 12 x 8 x 15 | Free, no strict weight published |
| Eurowings | 40 x 30 x 10 | 16 x 12 x 4 | Free small bag (Lufthansa Group) |
| Lufthansa | Generally similar to Eurowings' 40 x 30 x 10 cm small bag (same Lufthansa Group policy) — not independently confirmed | — | Verify with carrier before flying |
| Swiss | Generally similar to Eurowings' 40 x 30 x 10 cm small bag (same Lufthansa Group policy) — not independently confirmed | — | Verify with carrier before flying |
Bottom line: A personal item at 40 x 30 x 10 cm (16 x 12 x 4 in) or smaller clears every carrier in this table, including Ryanair's strict under-seat limit. Most Gulf, Asian, and Oceania full-service carriers — Emirates, Qatar Airways, Etihad, Turkish Airlines, Singapore Airlines, Cathay Pacific, Korean Air, EVA Air, Japan Airlines, Qantas, Malaysia Airlines, Philippine Airlines, China Airlines, Ethiopian, El Al, Xiamen Airlines, Zipair, Starlux, Jeju Air, HK Express/Hong Kong Airlines/Hong Kong Express, ITA Airways, Icelandair, TAP Portugal, SAS, Iberia, Vueling, Jetstar, Condor, and Norse Atlantic — publish one combined cabin-bag allowance instead of a separate personal-item spec. Air New Zealand does weigh personal items (see FAQ below) but its exact published dimensions change often enough that we're not listing a figure here. North and Latin American carriers — Air Canada, WestJet, Aeromexico, Copa, GOL, Viva Aerobus, Volaris, JetSmart, Porter, Hawaiian, Sun Country, and Avelo — generally follow a policy similar in spirit to the US table above, with dimensions that vary by fare. For any airline not given exact numbers here, confirm the current figure on its own site before flying.
Frequently Asked Questions
What is the maximum personal item size on a plane?
There is no single US-wide maximum — each airline sets its own. Common limits are 17 x 13 x 8 inches (JetBlue, Breeze) to 18 x 14 x 8 inches (American, Spirit). United is stricter at 9 x 10 x 17. Sizing your bag at 17 x 13 x 8 or smaller clears every major US carrier without checking each policy.
Which airline has the biggest personal item allowance?
Southwest at 18.5 x 8.5 x 13.5 inches and Allegiant at 7 x 15 x 16 inches are among the largest published US personal-item allowances. Spirit's 18 x 14 x 8 is also generous compared to United's strict 9 x 10 x 17. If you fly multiple airlines, size your bag for United to be safe everywhere.
Can a backpack be a personal item?
Yes — backpacks are the most common personal-item bag. Any backpack under about 20L in a low-profile shape clears personal-item limits on every US airline. Larger travel backpacks (30-45L) are typically too tall to fit under the seat and count as your carry-on instead.
Do airlines weigh personal items?
US airlines rarely weigh personal items — the size limit is the practical rule. International low-cost carriers (Ryanair, Wizz, easyJet, Air New Zealand) do weigh them, with typical limits of 7-10 kg. Frontier weighs the carry-on + personal item combined at 35 lb. On any international itinerary, weigh at home to be safe.
What happens if my personal item is too big?
The gate agent will ask you to check it, adding a $50-100 fee depending on the airline. Some agents let borderline bags through if the flight isn't full; others enforce strictly. Fees are worst on Basic Economy tickets, where the airline has more incentive to charge. Pick a bag well inside the limit to avoid the risk.
Do carry-on backpacks count as personal items?
Only if they meet the personal-item size limit and fit under the seat. Most travel backpacks (30-45L) are too tall — they count as your carry-on and go in the overhead bin. If you want to bring a backpack as a personal item, use a 15-20L pack in a low-profile shape.
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