I hope you never have to see your Z3 in this condition, but below are some pictures of a Z3 after its airbags had been deployed. I’m not sure whose Z3 this is; it was parked at a BMW dealership.
This first picture shows the passenger side airbag. It is much larger than I expected it to be. The fabric looks like a thick, almost canvas like surface.
The driver’s side airbag was much smaller, but it looked like someone has pushed part of the bag back into the steering wheel. Looking around the cabin, I expected to see some white powder, but the interior was clean.
What surprised me the most was how little damage there was to the front bumper. I expected to see a lot more damage if the impact was enough to set off the airbags. It is my understanding that the Z3 knows if you are wearing your seat belts or not and will deploy the airbags in a lesser impact if you are not wearing your seat belt. I don’t really know any details, just observing how little damage there was to the front bumper.