I haven't used this for air travel yet, so I am reserving a star in case it doesn't fit under a seat. If it does, it will fit my needs perfectly. I am a leisure traveler and usually check a bag, so I don't need to carry on a week's worth of clothes. I wanted this bag to replace the shoulder bag that I use to carry entertainment and comfort items for the flight. For this, it is perfect. The main compartment opens like a clamshell, with a very simple latch system that you can employ if you don't want the bag to open fully. This is handy for retrieving the contents with the bag upright in a confined space. Half of the clamshell is basically a box, which makes it perfect for packing things like cameras, headphones, readers, an empty water bottle, etc. The other half is a padded pocket which will easily hold my 12.9" ipad. The outside has two pockets, handy for travel documents and compressibly items. It roles well and the handle is the right height for me (I am 5'2"), but might be too short for a tall person. It is very light weight and seems sturdy enough, although I don't think I would trust an automated baggage handling system with it. When not traveling, I use it to carry art supplies. It is also perfect for that.