With the mason jars they don't wear out as fast since the lids are 2 peice and the rubber part doesn't "rub" against the rim of the jar wearing it out like a normal store bought sauce jar would. So the seal last a lot longer of not forever with a mason jar.
goody, thx man. the seals on my mason jars are small like sauce jars, but they're canning jars, so are they different??? i know which mason jars ur talking about, the ones were the lids latch on the outside and they have a nice bigger plastic seal(inch wide), i'd guess those are the ABSOLUTE best