Those manila mailing pouches are the bane of every carded collector. I've had a few shipped like that before I learned to demand boxes and they usually arrived with mashed bubbles. The figures themselves were never broken, but they're far less attractive in a display when it looks like a brontosaurus tread on the thing.
Older SW figures (pre-Vintage Collection) with larger, thicker bubbles can survive being sent in a mailing pouch, but even those can arrive with dents and creases. But Vintage? I love that line more than any other in the modern collecting era, but its bubbles are way too fragile. They'll dent if you so much as breathe on them the wrong way.