Originally Posted by ShowMama

I have often used pint jars that were saved after the purchased food in them, such as mayonnaise, was gone, but I've only used them for hot water bath canning, not with the pressure cooker. The regular sized lids and rings fit them and the jars have held up very well for the most part. There has been occasional breakage, but that happens with regular purchased canning jars too. My mother also "recycled" mayonnaise jars in her canning, at least as far back as I can remember. Some of those jars were used over and over, year after year, and worked just as well as Kerr or Ball jars.

I don't see a problem with this as long as you check each jar for cracks or nicks and handle them carefully while canning, which should be the rule for ANY jars you might use.