I don't know about the Boston Bag, but for anyone wondering, I have used a firm stabilizer for the bottom of my Zucca Mamma. I like to accentuate the shape, otherwise it has quite a bit of sag like the LVSpeedy, maybe more so, because aside from the heavy buckle it is all fabric. I bought my bag used, and while the hardware and leather bits were showing a lot of wear, the Zucca fabric itself was in fantastic shape. Maybe Fendi uses steel threads!