Yep, that's the right bag, but it is really confusing because the bag says it is for the 9.77.25 which is the previous Turbo III model. I think that the one we have is a 9.20.26 or something like that. For some strange reason they don't mention the later Turbo III model that we have. It also fits the Turbo IV which is a much bigger stainless steel industrial VAC. The Turbo IV was discontinued long ago and was much taller so that the bags fit better. Also, the previous Turbo III model was somewhat taller than the one that we have. Anyway, the proper way to install the bag is to have it go straight down the front and then across the bottom and up the back a few inches. Once it starts to fill up it will puff up like a balloon and there shouldn't be any problems. But I do agree that they could have designed a much better fitting bag instead of just using the bag for the old models. I have a feeling that Fein has gone downhill from what they used to be.