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I have not heat sealed them. I started using them in September 2021 ( my first grow ) Them do not let light in or smell out. I don't know how they burp themselves, I am not sure why people heat seal them. I also use a temp. and relative humidity gauge in each bag. Mine have been curing almost 4 months and the flavor is still continuing to increase. I can not find a better and easier way to cure weed.  The Grove bags really work and and actually are cheaper and way more efficient. Best if luck (really no luck to it) Let me know how they work out for you.