I am not an expert on this subject but I think it has to do with which side of the bag the hot boiling water is in direct contact with. The heat itself may not degrade the plastic as much as direct contact with boiling water. I do know that the FDA has approval ratings for bags you put in boiling water and bags you pour boiling water into. And those standards apply to different bags. As far as I have been able to find out there is not one bag that is considered safe to use both ways.
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