Bubbles in unopened store bought items? I've noticed air bubbles in several things I've purchased recently. From pasta sauce to salad dressings to salsa.  All different brands, all different flavors.  I see air bubbles inside the jars/bottles, and I wonder why this is, and if it's normal.  Are these items safe to eat?
1.Some companies when they pack would fill it with a air form of preservatives.

2.Other reason for the bubbles could also be simple air that was trapped when it was packed or sealed in the container or packet. And maybe the container/packet was shaken up a bit when dispatched, causing the air inside to move around in the product.

should have no effect on the product. Just trust the best before date. (Unless it tastes funny) :)