I have a shape charge and use it for this. I like it. My only complaint is the shoulder strap adjustment but this doesn't prevent me from liking and using it.
And, if you're going to use it as a carry on please...........get it to fit the airline size guidelines. Don't be one of those people who bring on a carry on the size of a refrigerator and take up a bunch of everyones' time trying to stow it...