Quick answer
Mascara counts toward your liquids allowance. Almost every commercial tube is well under 100ml, so the tube itself is fine. Confiscation happens when your liquids bag is overstuffed or doesn't close.
Cabin vs checked baggage
| Where | Allowed | Notes |
|---|---|---|
| Cabin | Yes, in your 1L liquids bag | Most tubes are 5–13ml |
| Checked | Yes, unlimited | Pack inside a zip bag |
Why was my mascara taken?
- Your liquids bag wouldn't close — security removes items until it does
- The mascara was in an oversized container
- You bundled it with sunscreen and perfume and went over 1L total
- Officer discretion at a strict checkpoint
International travel notes
Same 100ml rule worldwide. At 2L airports (Gatwick, Edinburgh, parts of Amsterdam) the entire makeup bag can stay in your hand luggage. At every other airport it comes out at the tray.