This fit perfectly into the Delta overhead bin on their Boeing 757. No worries at all! I looked at dozens of these bags before selecting this one, and it is a very good, durable, sizable bag. I just returned from Ecuador and the Galapagos Islands and I decided this time to go with a carry-on for the 10 days my wife and I were there. She bought one just like this one! It fit all we needed..stands up perfectly fully loaded...no tipping over like others reported..not sure why it would. Very quality materials. It did have to be loaded on to the smaller A320 Airbus (although I think it would have fit in the overhead bin...Galapagos rules have a strict weight limit). It has 2 wheels which I prefer..easier to load in the bis...but...I can see why people like the 4-wheel versions...they do seem quite maneuverable in the airports and otherwise.