A two-way humidity pack holds cannabis flower between 58% and 62% relative humidity inside a sealed container. Keep that container at 65°F to 70°F and out of light. Boveda and Integra Boost are the two brands stocked in most shops. The pack controls moisture. It does not bring back terpenes that already evaporated.

humidity packs for dry weed rehydration

Target Numbers

  • Humidity: 58% to 62% RH. 62% is the common pick for flower you smoke or vape. Some users drop to 55% for dry herb vapes.
  • Temperature: 65°F to 70°F. Stay under 77°F. Heat converts THC into CBN and thins the smell.
  • Light: none. UV breaks down THC. Use amber or opaque glass, or keep the jar in a cabinet.
  • Air: small headspace. Oxygen oxidizes cannabinoids and terpenes.

How a Two-Way Pack Works

A pack holds a saturated salt solution behind a membrane. Water vapor crosses that membrane in both directions. When the jar runs damp, the pack takes moisture in. When the jar runs dry, the pack gives moisture back. Output sits at the number printed on the pack until the pack is spent.

how to use humidity packs with weed

Boveda sells 58%, 62%, 65%, and 69% packs. Integra Boost sells 55%, 62%, and 69%. For flower, 62% is the standard shelf pick.

cannabis humidity control packs

Sizing a Pack

Match the pack to the weight of flower and the volume of the jar. Boveda's chart lists a 4 g pack for up to 14 g of flower, an 8 g pack for up to 28 g, and a 67 g pack for up to 450 g. A pack that is too small for the container will not hold the target RH. Do not cut a pack open.

Ideal Humidity for Cannabis Curing Guide

Lifespan

Boveda states a pack holds its rating for 2 to 4 months in a sealed jar that stays closed. Each opening exchanges air and shortens that window. A spent pack turns stiff and grainy. Integra Boost ships with a replacement card, and a dot on the card changes color when the pack is done. Reuse and recharge guidance differs by maker. Follow the instructions printed on the package.

Steps

  1. Pick a glass jar with a gasket or a tight screw lid. Amber or opaque glass blocks UV.
  2. Fill the jar. Leave as little air as possible above the flower.
  3. Drop in one pack sized to the contents.
  4. Seal the lid.
  5. Store in a dark cabinet at 65°F to 70°F.
  6. Open the jar to remove product, then close it.
  7. Check the pack every 2 weeks for the first month.

What to Avoid

  • The refrigerator. Cold glass pulls condensation as it warms, and wet flower grows mold.
  • The freezer. Ice crystals form, and frozen trichomes break off.
  • Orange peel, bread, and lettuce. They add moisture with no control and carry mold spores.
  • Windowsills, car consoles, and heat vents.
  • Splitting one pack across two jars.
  • Plastic baggies for more than a few days. Vapor passes through the film.

Signs of Trouble

  • Above 65% RH: mold risk. Look for white fuzz and a musty smell. Discard the flower if mold is present.
  • Below 55% RH: flower crumbles and smokes hot. A pack can add moisture back. Lost terpenes do not return.
  • Pack feels stiff, crunchy, or dry to the touch: replace it.