For those transferring tins to jars, you might also want to weigh into your logic that Mason jars do not recommend that anyone store food in their jars for more than two years. Of course, this is food that can become dangerous to eat. But, the longevity of jars has never been fully explored in the 10+ years range... adding in that "some" have reported that their jars didn't seal fully either. That said, I would logically say that jars are just as "ify" as the tins are. Bags certainly haven't been fully explored for longevity, with Dan (what was his PM handle? had the Frank Sinatra avatar) reporting that he found bags to have their failures being at the seals, and another member found pinholes in bags after a certain amount of time. Peckinghombre showed photos of his jars dipped in paraffin wax. So...
Another thought is that even if you do not plan to ever resale your tobacco (me included), that our family ay want to put our cellars on the market for resale after we pass. And, I know that I would never buy something in a jar with merely the smoker's self-made labels (or even if the actual tin was cut out and added). So, surely tobacco in a jar would never bring as much in return as a sealed tin. Or, at least I have never seen a jar bring as much money as a tin.
But, if forums and facebook forums all start suggesting people bury the tobacco in old coffee can in the backyard, I would merely think it was humorous, but I would at least weigh in with my own opinion. You guys can all do what you want. It is more about peace of mind. But, with tins and even jars, you can easily check the seals by trying to open them. A jar should require something to pry up the lid, same with tins, and bags you could probably check by weighing the bag down under water, which is kind of elaborate, but the only way I can think of check the seal.
