I spent the last 35 minutes canning my last jars of pasta sauce. The lids were Mainstays (Walmart brand). EVERY ONE of them came out with the lid dented. It's like they buckled during processing. I had to pull them all off (while hot) re-lid and am processing them again. But now it's 11:15 and I have to work in the morning! I am peeved! Every last one came out bad, while all the Ball lids are fine. They will be hearing from me tomorrow!