They are basically 'humidity packs' designed to keep whatever you place them with within the stated humidity range..the packs come in different percentages (and sizes) - 32% right through to 84% humidity.
Many feel 62% (or 58%) humidity is the 'ideal' for curing weed and use them in the curing stage.
The packs work in two ways..they will increase humidity or decrease it to reach the particular percentage you have purchased and chosen to use
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