How to Use a 62% Cannabis Humidity Pack: Step by Step

A 62% two-way humidity pack holds the air inside a sealed container at about 62% relative humidity. Put cured flower in an airtight glass jar, add one pack rated for that jar size, seal the lid, and store the jar in a dark place between 60°F and 70°F. Check the pack and the flower once a week.

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What the pack does

Two-way packs both release and absorb water vapor. If the sealed space runs dry, the pack gives up moisture. If the flower is too wet, the pack pulls moisture out of the air. The target is a steady 62%, which keeps flower pliable enough to grind and dry enough to resist mold. Packs do not cure flower. They hold a cure that is already finished.

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What you need

• Cured cannabis flower, dried and trimmed
• Airtight glass jar with a sealing lid
• One 62% humidity pack sized for the jar
• Hygrometer (optional, but useful)

Step-by-step

1. Fill the jar no more than three-quarters full with cured flower. Leave headspace so air can move.
2. Wipe the inside rim of the jar dry so no plant material sits on the seal.
3. Place one 62% pack on top of the flower. Do not bury it or tape it to the lid.
4. Seal the lid until it stops. Press the center of the lid to confirm the seal.
5. Store the jar in a dark cabinet at 60°F to 70°F, away from sunlight and heat.
6. Open the jar once a week for five minutes to exchange air, then reseal it.
7. Read the hygrometer after 24 hours. A steady 58% to 65% means the pack is working.
8. Replace the pack when it turns stiff, crunchy, or dry at the edges, or every two to three months.

Sizing and placement

Match the pack to the container volume, not to the weight of the flower. A pack rated for a small jar will struggle in a large tote. For a quart jar, one small pack is enough. For a gallon jar, use a larger pack or two small ones. Keep the pack above the flower so air can reach both sides. Do not add a pack to flower that is still wet from harvest. The pack will pull moisture, but the cure needs to finish first.

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When to replace the pack

A working pack feels soft and gel-like. A spent pack feels hard or grainy. Replace it at that point. In a jar opened often, expect to swap the pack every four to eight weeks. In a jar left sealed, three months is typical. Write the date on the lid so you do not have to guess.

Mistakes to avoid

• Do not use a 62% pack on flower that is still drying. Finish the dry and cure first.
• Do not stack packs in a jar with no air gap. One pack in open space beats three packed tight.
• Do not store flower in plastic bags for long periods. Plastic breathes and the humidity drifts.
• Do not skip the weekly air exchange. Stale air and trapped ethylene dull the smell.