I am in a couple of canning groups, and there are many complaints about the Walmart jars breaking and the lids warping and not sealing correctly. I have had a jar break when I took it out of the canner and set it on the towel. The rest of them were fine, so I think it just might have been that jar's time to go to jar heaven.
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I'm a geek and a mom, and I write about it at Confessions of a Geeky Mom: http://confessionsofageekymom.com/
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