Looking at this bag and the original Miele bag side by side I could see the differences. The replacement bag uses a much thinner filter paper. The Miele bag looks like a pillow and the replacement looks like a pillowcase. Next comes a thin plastic bracket that holds the bag to the hose. The bracket needs to be curled under the hose, Miele fits perfectly. The price was much better, but if your vacuum doesn't catch all the dust in its bag, is it really worth it? Maybe you're throwing small particles into the air?