I changed the filter on my Dirt Devil Simpli Stick (which I liked before I changed the filter) and found that I blew all the collected dust back out of the vacuum. I spent a lot of time making sure I bought the correct replacement filter. Even the numbers on my old filter matched the new one I ordered. Something is wrong with the filter. A fabric that is too thick or a wrong fit will cause dust from the device to enter my room. I guess I'll have to toss that favorite vacuum cleaner in the trash because my old filter has a hole in it. REALLY DISAPPOINTED.