Product review (1 stars): Collapsed filter
While these filters are thick, which I was looking for, they have nothing to help them retain their shape.  With in a day the filter had collapsed to the point that it was only a couple of inches tall (edges eithe flop outward or flop inward).  The last filter I had bought, different company, didn't collapse, and while it was thinner it helped to maintain the humidity better because it stayed upright.  I cant get the humidity above 35% with this filter. I just tried propping it up with unfolded jumbo paper clips in an effort to keep it upright. I regret that I bought a four pack.  What a disappointment.  Dont buy.