According to this[1], it changed in 2004 (in the US) More info about Saran wrap[2]. It's effectively 3000x more permeable to Oxygen that the old version. [1]

According to this[1], it changed in 2004 (in the US) More info about Saran wrap[2]. It's effectively 3000x more permeable to Oxygen that the old version. [1] https://uspackagingandwrapping.com/plastic-wrap-101.html#:~:text=The%20original%20plastic%20wrap%20that,alternatives%20have%20become%20more%20popular https://uspackagingandwrapping.com/plastic-wrap-101.html#:~:.... [2] https://en.wikipedia.org/wiki/Saran_(plastic) https://en.wikipedia.org/wiki/Saran_(plastic)