I bought this to use on trips as a carry-on.  It is so huge and holds so much stuff.  If you have it stuffed to the top you will have a hard time fitting it under the seat in front of you on a plane.  Otherwise you can fit it, though you might not have enough room depending on how much foot space you need, etc.  Being able to wheel it or easily carry it over my shoulder with the handles was great.  For a $20 bag I think it's a great deal.