I didn't know about this and that's extremely disappointing. I already bought one bag from them but I guess I doubt I will be buying another.

They're still making a lot of things in the US, there's a list on this blog post from last fall (https://www.tombihn.com/blogs/main/fall-2025-factory-update-...). The "materials and transparency" section of each bag's page tells you where it's made. But the process has begun and you should probably grab anything you've been coveting before that list grows.