Hah! As someone who spent decades of my adult life outside of the US, I often ask myself, “why don’t we have folders like this (except 8.5” x 11" instead of A4) in America?"
Now that I live in the US again, I’ve searched repeatedly at Office Max, and even on Amazon I have to buy A4 size (much better than nothing, but not quite right).
The lack of these incredibly useful clear plastic folders remains a mystery. They are ideal for organizing categories of papers, leaving them visible and secure, but with individual pages easily added or removed.
One example of how I use them is to organize sheet music for my Javanese gamelan class. When we learn new pieces, people inevitably leave their music at home, or don’t have a copy that shows the part for particular instruments - whatever. It’s so nice to simply go to my folder that contains multiple copies of the notation people might want, securely held, and easily pull it out.
“Regular” American style folders don’t work the same - manila folders allow papers to slip out easily, and since they are not transparent you can’t easily see what’s inside. The plastic folders that are sealed on three sides are awkward - inserting or removing a single sheet is a PITA.
Totally different product: large thermos bottles (not single-serve, but containers that can hold enough liquid for 10-20 servings) are a trillion times better in Asia. When I lived in Indonesia, I used to heat drinking water the day before a big social event, and put it into a thermos receptacle. 24 hours later, people could easily serve themselves steaming hot water for tea or instant coffee. In the US, I can’t find water receptacles of the appropriate size - water cooler dispensers don’t have anywhere near the level of insulation needed to maintain hot or cold temperatures for long periods of time.
If I had been smart, when I left SE Asia I would have brought lots of folders and a couple of large thermos receptacles with me for use in the US, but it never occurred to me that such useful items would be unavailable. I remain mystified that they are not.