Air bubbles in sausage Are air bubbles/pockets/loose casing in raw sausages okay food safety-wise? I don't know if it's just because they didn't fill them as full or if they formed from gases/bacteria. They are five days before the best before date Merguez sausages. Thanks!
It is most likely just a void.  It is hard to pack a casing 100%.  There will be voids.   

Could it be (toxic) bacterial gas? Maybe but not likely.