I used this as my "personal bag" on flights for a 3-week trip to 6 countries in Europe, so lots of flights/trains (also had a carry-on suitcase). This holds a lot and I never had trouble fitting it under the seat. I was nervous for the Ryanair flights since I've heard they are really strict about sizes, but luckily I didn't have problems. It has so many pockets inside and the separate shoe compartment is nice. I like the secret zipper on the luggage strap which allowed easy access to my passport. The bag held up really well and has no scratches or stains. It may be a little pricey, but I think the quality is good and it will last a long time. I got this in the chocolate color and it's really cute in person.