Originally Posted by ToiletDuck

22" is generally you're best option if you're a commuter since it will slide under the jumpseat of a 737 and fit in the newer overheads.

As far as cost goes get what you can afford. I found a $50 bag that I used for my first 1.5years. It still works and now my mother uses it from time to time. Once you get kicked up to your new payscale then jump on a LW or my favorite, a strongbag. I've had my strongbag for 3yrs now. Well built and lighter than the LW. I had two small issues and both were resolved very quickly with one email. Great customer service. I've never had a LW so I can't speak about them however I'm completely sold on strongbags after 3yrs of use.