Interesting. Maybe I'm an old pooper but somehow the thought of cooking dinner inside of a zip-log bag is hard to get my head around. I know the temp is only 145, for med-rare anyway, it's just that with all of the justified angst over the use of which type of plastic for water I somehow think we should know what the average zip-log bag does at those temps for, what, it's a lengthy spell, right?

Maybe the thermal seal bags are different, who knows.

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1986 300SDL, 362K
1984 300D, 138K