William Bronson wrote: Both have imbued energy,glass seems to leave no poison behind,where as plastic contains plasticizers that leach,and have known environmental concerns.
Casie Becker wrote:Something else to consider about glass, if you're keeping these at home. Many glass containers are reusable. My mother was really excited when she found out that there is standardized information available for canning in the microwave. Basically anything that very acidic or very high sugar (water bath canning options) can be sealed in the microwave.
She reuses commercial jelly jars successfully in this fashion to extend the life of bulk salsa batches. I'm not going to reproduce the depth of research mother does, but she says it's a very well accepted technique in Australia.
http://www.backyardchickens.com/t/168735/interesting-article-on-microwave-canning Someone posted a relevant article, verbatim here that goes into more detail