🚨🚨 IMPORTANT: fold the bag end over. Any moisture or fat in the sealing area will destroy the heat seal. 
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Discussion
Oh I like this I'll be picking me up a vacuum sealer in December to go along with a sous vide thanks for the tips!
Good tip! Can you freeze and then defrost to sous vide in the same bag?
These bags seem heavy enough to do that but I've never tried it.
I found this though. Seems they are fine for SV.
https://www.reddit.com/r/sousvide/comments/v3on7n/are_the_costco_kirkland_vacuum_sealing_bags_safe/
Nice, I’ll have to try buying in bulk off the local butcher. Might save a bit of money with my steak habit! I guess just freezing in the SV bags I’ve got would work