I have made tons ob Bow Tucks and other bags, with a variety of different fusibles, interfacings, etc and am still confused at all the different products out there. I agree, Pellon 987 isn't firm enough to make bags stand on their own, but it is easy to work with. I tried a very stiff fusible, and found I couldn't sew it very well on my machine. I just read today, after much time researching, about pellon SF101, which is woven and that means it will drape and move with the fabric better, not causing wrinkling, etc. It about doubles the layers, so you might not want to use it on both the outside and lining. If fuses nicely, but you have to pre-shrink it if using it on something that might get washed. What was recommended was using both SF101 AND Pellon sew-in 30, 40, or 50. Another recommendation was combining the SF 101 with Pellon 988. I haven't tried any of these suggestions yet, but will since I make allot of bags and purses.This person was NOT a fan of fusible fleece, which is what so many bag patterns call for. I would love to get my purses just a bit more body and not have them so floppy, without making it near impossible to sew on my machine, and not having wrinkles or un-natural stiffness.