Any container holding pressure that isn’t just oxygen would rupture because they were designed to work under atmospheric pressure not 80% atmosphere.

Things like hydrogen, natural gas containment and basically any kind of balloon would not have a good time.

A sudden drop in outside pressure would be devastating to many structures because dynamic load from the gas slamming against the vessel walls.

Conversely anything containing a large amount of oxygen would suddenly be a vacuum instead of a positive pressure environment and would certainly fail.