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here:  I want to buy a vacuum sealer for food. The vacuum bags
do not have a hechsher. Normally, I buy ziplock bags that are
OU. To keep this general, I am hoping someone can elaborate on
the reason and ruling behind needing approval for food storage
containers. If the food is always room temperature or colder
when putting into the bag, does that make a difference? I
imagine the law is based on the transfer of taste from the bag,
which seems to imply the food going into the bag is warm,
because otherwise the transfer would not occur.  After looking
at star-k's list of items that don't need approval, which
includes plastic bags, I wonder why OU feels they do need
approval.  share|improve this question  marked as duplicate by
Seth J, HodofHod, Monica Cellio May 21 '13 at 15:33   Letting
something liquid sit in a container for 24 hours is kavush
("pickled") and can transfer taste as well sometimes. –  Double
AA May 21 '13 at 4:47 If someone <strike>as