Data quality
Data Methodology
How CarrySizer collects, verifies, and maintains carry-on baggage data.
- primary sources
- Official
- freshness gate
- 12 mo
- build validation
- Zod
Editorial responsibility and evidence
CarrySizer is responsible for this publication. Source blocks identify the claim, its scope, the source section and the date it was reviewed. Reviews labelled Codex are AI-assisted source research; they are not a named specialist sign-off or a hands-on product test. Older pages without a source block have not received this claim-level review.
We schedule volatile paid cabin-bag and ultra-low-cost rules every 30 days, other low-cost or strict policies every 60 days, and other operating records every 90 days. Historical records are reviewed every 180 days. These editorial deadlines do not shorten the separate 12-month freshness gate.
An article update date describes an editorial change. A source-review date describes the evidence check. We omit an unknown original publication date instead of copying the airline’s date or the latest update. A source fetch alone never creates a human verification.
Product shortlists use the exact manufacturer model and published specifications where linked. Fit conclusions are comparisons with stated airline limits; comfort, durability and security are not presented as measured without test evidence. Report corrections through our contact page.
How We Collect Data
Our primary references are official airline websites and published fare rules. Each airline record links to its recorded source. A link alone is not proof that every field remains correct: the source evidence block states which claims were checked, and the review queue identifies work still due.
Primary sources include airline carry-on policy pages, fare conditions PDFs, checked-baggage fee schedules, and — where available — official customer service confirmation via the airline's help center. When official sources conflict (for example, a website says one dimension and a fare PDF says another), we use the more conservative figure and flag the discrepancy in our notes.
What We Check
For each airline and cabin class combination, we record:
- Carry-on dimensions— length, width, and depth in centimetres, plus the linear sum (L+W+D).
- Weight limit— maximum carry-on weight in kilograms where the airline specifies one.
- Personal item— whether a personal item (handbag, laptop bag, backpack) is permitted in addition to the carry-on, plus its size and weight limits.
- Gate-check fees— the fee charged when a carry-on is rejected at the gate and must be checked, where published.
- Cabin enforcement notes— whether the airline is known to enforce size limits strictly, spot-check only, or rarely enforce.
Quality Gate Criteria
An airline entry must pass our internal quality gate before it appears on the site. All four of the following must be true:
Cabin dimensions required
All three measurements (length, width, depth) must be present. Entries that only list a linear total are not published because they cannot support accurate bag-fit calculations. When an airline publishes both a box limit and an L+W+D total, our checker enforces both.
Personal item flag required
The entry must explicitly state whether a personal item is included. We do not assume either way.
Source URL required
Every entry must have a direct link to the official source page. Entries without a verifiable source are held in draft until a source is confirmed.
Last checked within 12 months
Each record carries a last_checked date. Entries older than 12 months are automatically marked stale and excluded from featured placement until reverified.
Freshness Levels
We classify each airline entry's freshness based on itslast_checkeddate:
Checked within the last 6 months. Displayed without any warning.
6–12 months old. Displayed with a note suggesting you confirm with the airline.
Over 12 months old. Flagged prominently and queued for immediate reverification.
Source Confidence
Freshness is only the age of a record. Confidence is stricter: a page is labelled High source confidence only when it has an explicitverified_atdate, an official-source tier, a clean source-diff status, and present expected markers such as dimensions or weight. Legacy batch-imported records are shown as source review pending until those checks are stored.
We keepsource_captured_atseparate fromverified_atso an automated fetch never pretends to be a human verification.
Current freshness dashboard
Built from the same airline records that power the public tools. Latest recorded check: Sep 5, 2026.
170 records tracked
- Fresh
- 170
- Aging
- 0
- Stale
- 0
- Review due
- 53
Next scheduled reviews
- Wizz Air
- Vueling
- Norwegian Air
- Frontier Airlines
Independence: CarrySizer is an independent reference and is not affiliated with, authorized by, or endorsed by any airline. Airline names, fare names, logos, and trademarks belong to their respective owners and are used only to identify published baggage policies.
Disclaimer: Airline baggage policies change without notice. CarrySizer makes every effort to keep data accurate and current, but we cannot guarantee that the information displayed matches your specific booking, itinerary, or fare class. Always confirm carry-on rules directly with your airline before travel. We accept no liability for fees or denied boarding resulting from reliance on this data.
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