Best humidity for cannabis storage in a container
The target range is 58% to 62% relative humidity (RH) at 68 F (20 C). 62% RH is the midpoint most humidity pack brands build around. Below 55% RH, flower loses moisture and terpenes. Above 65% RH, mold and mildew grow. Light, heat, and oxygen also degrade cannabinoids. Humidity control solves one part of the problem.
best humidity for cannabis storage in a container
First pick: Boveda 62% two-way pack
Boveda makes a two-way pack. It adds or removes moisture until the air inside the container reaches 62% RH. Sizes: 8 gram for up to 1 ounce of flower, 67 gram for up to 1 pound. Put the pack in the jar, not on the flower. Replace it when the pack turns stiff and crunchy. In a sealed jar at 68 F, that takes 2 to 4 months. Price runs about $3 to $5 for one 8 gram pack, $15 for a 10 pack. Best for cured flower you open often.
best humidity for cannabis storage in a container
Second option: Integra Boost 62%
Integra Boost uses a salt and water packet. Same 62% set point. Sizes: 8 gram, 62 gram, 320 gram. Each pack ships with a replacement indicator card that changes color. Price runs about $2 to $4 for an 8 gram pack. Best if you want a visual cue for replacement.
best humidity for cannabis storage in a box
Third option: Boveda 58%
58% RH sits at the low end of the range. Some users pick it for vaporizers because drier flower grinds finer. Terpene loss is higher than at 62%. Use it for short storage, not months.
Fourth option: Boveda 55%
55% RH is the floor. Flower at this level crumbles and loses smell. Boveda sells 55% packs for cigar and herbal use. For cannabis, 55% works only if the flower arrives over-dry and you plan to use it within a week.
Fifth option: 69% and 72% packs
These are rehydration packs for flower that dried past 55% RH. Move the flower back to 62% within 24 to 48 hours. Do not store long term at 69% or 72%. Mold risk climbs.
Container choices
- Glass mason jar with a metal lid: airtight, no smell leak, low cost.
- CVault stainless steel: latch lid, built-in slot for a 62% pack.
- Infinity Jar: glass body, plastic lid, slot for a humidity pack.
- Plastic zip bag: not airtight, no humidity control.
How to check the number
Use a digital hygrometer. A $10 unit reads within 2% RH. Put it in the jar, close the lid, wait 2 hours. If the read lands at 58% to 62%, the pack is working. If it reads below 55%, add a new pack. If it reads above 65%, burp the jar for 10 minutes and replace the pack. Test cheap hygrometers against a salt test before you trust them.
Storage basics
- Temperature: 65 F to 70 F. Heat drives terpene loss.
- Light: dark glass or a closed cabinet. UV breaks down cannabinoids.
- Headspace: fill the jar 75% to 90% full.
- Pack count: one 8 gram pack per ounce of flower.
Cannabis is a plant material, so RH drifts as it sits. Check the hygrometer each week for the first month, then once a month.