Ok, here it is with only one handle and its soon-to-be-lining.
It turned out to be exactly 12" by 9". The handle isn't as stiff as it looks in the pic, but it does have clothesline sewn inside it.
So, what'dya think???
PS: I sewed in the zipper all by myself!! I have no idea if I did it right, though. lol. It looks ok to me, so it'll have to do. Now: off to attach the other handle and figure out how to handsew a zippered lining into a knit bag. hmmm....