I have been buying this product for YEARS. HEPA combo activated carbon is better at filtering out smaller particles than HEPA alone, and for those sensitive to dust, pet hair and dander, this is vital. I can't vacuum a room without it. Likewise! I recently switched from a standard household vacuum (when ours broke) to a commercial vacuum that doesn't quite fit in these bags. Unless you know the secret. Cardboard part next to the hole, suitable for standard vacuum cleaners! I love it! Hope that helps! And no, I'm not getting paid to watch, I just love sharing things that pertain to everyday life.