Best way to ship an ETB?

Hey I was planning to use USPS padded envelopes for these ETB, but didn’t realize how big they were. I would typically put them in a padded envelope first and then inside the USPS padded envelope. In this case after some stretching out of the USPS padded envelope I can barely get it to fit with no extra padding. Does anyone else ship like this?

Just put it in a box. Will get dinged in an envelope for sure.

USPS regional rate box A. You can get them on their website for free in packs of 10.