Clear plastic Kallax inserts?

[u/SideQuestAficionado]

I use several Kallax units as storage in my hobby shed, mostly for storing fabric. I'd love to have the fabric stacked in clear plastic bins so I can easily see what's inside, but I am mystified that IKEA doesn't seem to offer this, and I haven't found any third party options in the right size either. Ideally these would come with a lid, but beggars can't be choosers. Anyone know of a secret source of clear plastic kallax inserts? What does everyone else use to stash fabric in kallax? I'm currently using open-top fabric/cardboard inserts with a clear panel (from Amazon), but these clear plastic bins have become a slightly odd obsession, because I don't understand why they don't exist, and doesn't everyone want them?