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To throw my (small amount) of experience in here. Last weekend I fractionally sterilized using the Ziploc quart size freezer bags with the double-zipper. They're the ones with the red & blue press-zipper, not the plastic zipper that slides along the top.
But, these easily held up to the steam. I didn't have them in the water, instead I used my big pasta-boiling pot with a build in strainer. I just put a few inches of water in (so it was below the strainer bottom), and them steamed the bags for about an hour, three times with 12-16 hours in between each steam.
Three of the bags had popcorn in them, and were about half filled (popcorn was soaked overnight then boiled for about 30 mins prior to bagging). Then in a fourth bag I placed a piece of bread. Initially the bread bag was to just make sure the bags could hold up to the steam, since I didn't want to waste the popcorn. But I continued steaming the bread with the popcorn each time and am now using it as my "control" and so far nothing has grown on either the popcorn or the bread.
One of the bags of popcorn I put a ring of paper-towel tube that I cloned some oyster mushrooms from the grocery on, so it was about 60% covered in mycelium. It's been a couple days since I put the ring in and it looks like the mycelium has begun spreading in to the popcorn, and I don't have any other contams (yet).
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