I just renewed my passport and while it does seem a bit stiffer than previous versions it's still bendy.
My my most recent passport had a chip in it and was pretty flexible, more flexible than my new one. While I took good care of it, it did get bent a little while I carried it in a money belt. The chip never stopped working, but the scanners in Toronto had a tough time reading it on its last trip before renewal, so I am looking for ways to avoid bending my new one.
I haven't seen any particularly stiff passport cases on the market, and even if one existed I don't know that it would be slim enough to tuck it into my money belt comfortably.
When I wear a money belt I wear it at the small of my back because that's the flattest part of me, but it's still not genuinely flat. The various pieces of cardboard I've been experimenting with putting in with the passport aren't all that robust.
Does anyone have any tricks for keeping their passport from getting bent?