Product review (5 stars): GREAT PRODUCT
Bought a pack as backup to the product that qualified for Prime.  I was suspicious of the construction.
Very happy that I did.  This is far superior to the other product.
Very well designed/built and will last a lot longer than the other product because it has the coating on the outside part of the filter and has the reinforced metal spine between the 2 sections of the filter (outside coating | outer part of filter | metal spine | inner part of filter).
This filter will NOT slump down and prevent the humidifier from doing its job as the filter I was using before did.
I don't think I had the other filter in there 3 weeks and had to replace it because it had slumped down half way around the fan housing.
As of the writing of this review the product is not currently available.
I hope that will change by the next season because I am will be looking to buy more as long as I have my Honeywell 6011G Cool Moisture Humidifier.

Very highly recommended.