Don't forget that even BPA free plastics have a different chemical composition. Just because we don't know what the effects are yet, doesn't mean there won't be any. I know we can't eliminate all plastic from contact with food, but it's a good idea to be conscious of it and avoid it as much as possible. Least that is my opinion... and yes, the food doesn't come in contact with the lids when canning...
Female, age 51, 5' 9"
SW - 183 (Jan 22, 2012), CW - 159, GW - healthy.
Met my 2012 goals by losing 24 pounds.
2013 goals are to get fit and strong!