they all sag, the shape bends depending on what you put in it. they are durable, wonderful bags with so much class.
the only ways i know to 'fight' sag are to use a purseket (purseketDOTcom) or to put a book (a reading book, large agenda, file folder of papers, a piece of cardboard cut to fit the bottom inside (no on would ever see it but you, and you would love the shape of your speedy again) be creative!)