Well, I have an abundance of "regular" canning jars of various brands that I've accumulated over the years (in fact, where the heck did so many jars come from? ) Do those jars from the peaches fit a standard lid made for canning? (Like Kerr, or Ball) If so, I'd say they would be fine for at least water-bath canning. I really miss the "good old days" when Miracle Whip and Mayo (and probably other things) came in glass jars that fit standard canning lids; they were fine for water-bath canning, probably not so much for pressure canning but I don't do much of that anyway.
I mostly use pint jars, but do a few things (tomato juice comes to mind) in quarts.
