Update on an unusual cage, after multi-day wear
I got this cage, which has an unusual feature on its ring.
https://www.amazon.com/dp/B089DBRP8D
I wore it successfully for eleven days. On the twelfth day, for reasons that are not clear to me, my scrotum swelled, up, lapping over the basket. At the same time, I got that burning sensation under my scrotum. Obviously the cage geometry hadn't changed, so apparently my body had. I've had to switch to a similar cage, with a ring with the same dimensions and curve, but no basket, and now I'm fine.
It's a pity, because I liked that basket. It let me wear resistance leggings in comfort, and kept my cell phone from hitting my balls.