I just replaced my 8 year old 20 ml with another 20 ml. If you look at the amount of physical difference between the two, you're basically talking about the thickness of a sheet of paper. IMHO, if something's gonna puncture the 20 ml, then that sheet of paper isn't gonna help you much...I'd save the extra money and spend it on bleach.
Just my opinion, and what I did!
Janet
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