It takes a pretty good impact to break a mason jar. I drop them all the time. I've even went as far as tossing them up and batting them like a pop fly, with no issues to make a point on here many years ago. Of course, they will break given enough of a direct hit, eventually. But, we aren't talking champagne flutes here, but even those, I wouldn't hesitate to order from amazon.
Just wrap them well in old newspapers or any paper and pack them snug. We have enough things to worry about over breaking a borosilicate Mason jar under pressure from aged tobacco.
But, on the other hand, do what you want. I'm not twisting arms, just pointing out that these jars don't break easily.