The problem is that it just doesn't fit my new Simplicity Synchrony. The price is great compared to the overpriced Simplicity bag, but where the bag gets stuck on the suction nozzle it just won't hold up. You should try to push or slide it in and then securely close the bag's door, hoping it won't fall off. If you have Simplicity Synchrony, do not buy this product, it just doesn't fit.