"The diminutive Pilot bag isn't cheap, but if you travel a lot like we do, it makes a great investment. It's made well of high-tech materials, designed to last a very long time. I've never been able to wear out a Tom Bihn bag, no matter how much abuse I pile upon them.
On the plane, you should be able to get away with calling this a "personal" bag, like a purse, so that you can also carry another carry-on bag into the plane with you, which you can store in the overhead compartment while you keep the Pilot below the seat in front of you.
It works great for what it's designed to do, and it's a welcome bag to have by your side on those long flights. If you travel far and frequently, you'll appreciate this bag."