that are hard to find at Hepa. - There is no certificate on the packaging that it really is Hepa. The white lining inside the pocket is so brittle that it sometimes tears if you try to gently insert the plastic piece. Some pouches are actually taped where the outer seam is, covering the bottom third of the pouch. Often when changing the bag I saw that the white liner was torn and therefore filling the pleated vacuum filter. with dust and of course in my house but it's still the best quantity and price and I use so much of it so often that I just sort out the negatives. Whoever designed the inner white lining, I would suggest making it thicker or heavier.