I travel a lot for work, and one thing that still surprises me is how difficult it is to know whether a suitcase actually complies with an airline's carry-on rules.

Every airline seems to have different limits for:

1. Carry-on dimensions
2. Personal item size
3. Weight limits
4. Different fare classes
5. Different routes

Even bags sold as "carry-on approved" don't always fit every airline.

I got tired of manually checking airline websites before every trip, so I built a small tool:

https://luggagevalidator.com

Instead of looking up dimensions yourself, you can:

1. Check whether your luggage fits a specific airline
2. Compare baggage rules across airlines
3. View official cabin baggage limits in one place
4. Quickly see if your suitcase is too large before flying

The goal isn't to replace airline information—it's simply to make it much easier to understand and compare the official rules.

It's still a work in progress, so I'd really appreciate any feedback.

If there are features that would make it more useful for frequent travelers, let me know!