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Never long term store weed in anything plastic/mylar.

Get an airtight glass jar that is close to the size of weed you're storing, buy a cheap hygrometer from ebay, pop it in the jar.

If it's around 58-62% relative humidity then don't bother with Boveda packs. If it's less or more throw one (8g Boveda 62% pack) in per 14g of product.

Keep the .jars at around 18 degrees.

As soon as the RH on the hygrometer reads around 60%, take the Boveda packs out. They have a tendency to remove the terpenes from the weed.

Cheers BB
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