I have a new speedy 25 ebene damier and was concerned about the sag as well. Like another previous poster, I asked the sales lady at the LV store about it and she didn't even know what a 'shaper' was and that the speedy is meant to 'sag' since the bottom and sides are made out of one piece of canvas. If they didn't mean it to 'sag', they would have made it differently. So I've decided not to get a shaper for mine for now. Plus she said the 25 is less likely to sag very much at all.