Well, just know that you can't purchase a single flap in stores anymore. If you want a brand new piece, it is going to be a double flap which is why your SA didn't say anything. I think people can rock whichever size flap they want regardless of height!! At the end of the day, you have to pick the bag that's perfect for you, the owner and user of the bag. IMPO, the m/l works best day to night but the jumbo is great too! It also really depends on how often you will be carrying it, how much you want to put inside of it, etc. GL on deciding and hope to see a reveal!