Guides
Editorial explainers that link into the live airline and bag catalog — not duplicate airline pages.
- Airline Carry-On Size Guide
How airline cabin bag limits work, why they differ, and how to check your suitcase before you fly.
- Personal Item Size Guide
What counts as a personal item, typical underseat sizes, and why budget airlines care so much.
- Carry-On vs Personal Item
The difference between cabin bags and underseat items, and how both are checked.
- How to Measure a Suitcase
Measure exterior dimensions the way gate agents and sizers do — including wheels and handles.
- Do Wheels and Handles Count?
Yes — published airline dimensions are almost always exterior measurements.
- How FitsTheBin Calculates Bag Compatibility
Orientation-independent dimension matching, linear totals, weight, and tight fits.
- How Strict Are Airline Carry-On Sizes?
Why some airports measure every bag and others rarely do — and how to plan for the worst case.
- Airline Carry-On Weight Limits
Which airlines limit packed weight, and how empty bag weight affects what you can pack.