Kenmore Bags with a translucent backing?

[blackheart]

Josh picked up a Kenmore upright for me which came with a bunch of bags and among those bags there's like 16 of these really odd bags. I've heard of the lewyt speedsac which had a clear strip and I feel like i've heard of bags with a transparent side pre-installed into....some brand.
But these bags are new to me....what's with them? Were they used as some sort of demonstration item?

 

[cheesewonton]

That makes no sense. How can it flow air?

 

[blackheart]

Just to clarify the inlet side is made of the typical hepa bag material it's only the opposite side that's made of the clear material. It's cutting the surface area of the filter in half in order to show the material in the bag.
I'm *guessing* that they weren't like available to the average person, as they seem like some sort of demonstration.