The best humidity packs for cannabis storage are Boveda 62% for everyday jars and Boveda 58% for dry climates or dry-herb vaporizers. Boveda takes first place because it holds a jar at one exact relative humidity level and works in both directions, adding moisture when flower dries out and pulling moisture when it runs wet. Integra Boost 62% is the runner-up, with a salt-free formula and a replacement indicator card.
Cannabis Flower Curing and Storage Guide
This comparison covers the packs sold in most US dispensaries and smoke shops, what each one does to cured flower, and how to pick a percentage that fits your setup.
how to store cannabis flower long term
Top picks at a glance
- Best overall: Boveda 62%
- Best for dry-herb vapes and dry climates: Boveda 58%
- Best salt-free option: Integra Boost 62%
- Best for months of storage: Integra Boost 55%
- Best for bulk: Boveda Size 67
- Best reusable, non-two-way: Raw Hydrostone
1. Boveda 62%: best overall
Boveda 62% sits in the sweet spot for cured flower. It keeps cannabis near 62% relative humidity, the range most growers target after the cure. The pack acts as a two-way buffer instead of a one-way sponge.
Optimal Humidity for Cannabis Flower Storage: A Guide
- Humidity: 62% RH
- Sizes: 4 g, 8 g, 67 g, 320 g
- Lasts: about 2 to 4 months in a sealed jar
- Best for: half-ounce to one-ounce jars you open often
Why it wins
Consistency. A 62% pack removes the guesswork from burping jars and keeps flower springy instead of crunchy. It also blunts the slow dry-out that happens each time you open the lid.
Should You Store Cannabis in the Fridge?
What to watch
Packs turn stiff and crunchy when spent. Squeeze the pack to check, and swap it when it feels hard. Never cut a pack open, and keep flower from resting against the wet membrane.
2. Boveda 58%: best for vapes and dry climates
Boveda 58% holds flower a few points drier, which suits dry-herb vaporizers and homes with low winter humidity. Ground flower stays fluffy, and the risk of mold drops. People who find 62% too sticky for a grinder often prefer this level.
3. Integra Boost 62%: best salt-free option
Integra Boost uses glycerin and water rather than salt, and each pack ships with a dot card that changes color when replacement time arrives. Performance in a sealed jar matches Boveda 62% for most users. The card takes the guessing out of when to buy more.
4. Integra Boost 55%
At 55% RH, this pack targets long storage. Growers who hold flower for months pick it to cut mold risk and slow terpene loss. The trade-off is a drier feel in the grinder, which some smokers dislike.
5. Boveda Size 67: best for bulk
A Size 67 pack handles up to a pound of flower, so it fits a full mason jar or a small curing tote. One pack per container is enough. Buying the large size costs less per gram of flower than stacking small packs.
6. Raw Hydrostone: reusable, but not two-way
A Hydrostone is a clay puck you soak in water and drop into a jar. It adds moisture but cannot pull excess humidity back out, so flower can go too wet if you leave it in. Use it for 30 to 60 minutes on bone-dry bud, then remove it and add a two-way pack.
How do two-way humidity packs work?
Two-way packs hold a fixed humidity by balancing a salt or glycerin solution against the air in the container. When the jar runs drier than the target, the pack releases water vapor. When the jar runs wetter, the pack absorbs moisture.
Water activity matters more than moisture content for mold risk. Keeping a jar between 58% and 62% RH holds water activity in a range where mold and bacteria struggle to grow.
Boveda vs Integra Boost: which is better?
- Boveda: salt-based, sizes from 4 g to 320 g, no indicator, goes stiff when spent
- Integra Boost: salt-free, sizes from 4 g to 67 g, includes an indicator card
- Both: two-way control, food-grade contents, similar cost per jar
Pick Boveda if you want the widest size range and the most widely stocked brand. Pick Integra Boost if you would rather see a card tell you when the pack is done.
What humidity level should you pick?
- 62%: standard for cured flower in a jar you open often
- 58%: dry climate, vaporizers, flower you grind fine
- 55%: months of storage and lower mold risk
- 69% and up: rehydration only, in short bursts
Skip 69% and higher for flower you plan to smoke. Those levels push water activity up and invite mold.
How many packs do you need?
Match pack size to jar volume, not to how much flower you own. One 8 g pack covers up to about a half ounce (14 g), and a 67 g pack covers up to a pound. A jar that is half air needs a bigger pack or a smaller jar.
How long do packs last?
A pack lasts two to four months in a sealed jar at room temperature, less if you open the jar daily or store it in heat. Integra Boost packs show status on the included card. Boveda packs go stiff.
Mistakes that ruin a good cure
- Leaving flower in the dispensary bag, which is not airtight
- Using a 69% or 72% pack as a permanent fix
- Storing jars in a hot car or on a sunny shelf
- Overstuffing the jar so the pack has no air around it
- Leaving a spent pack in the jar for weeks
FAQ
Are humidity packs safe to smoke?
Yes. Boveda and Integra Boost keep food-grade contents inside a sealed membrane, so nothing enters the flower. Pull the pack out before you grind, and never open one.
Can you recharge a Boveda pack?
Boveda says no, and soaking one in tap water adds minerals and mold risk. Replace spent packs instead. A clay Hydrostone is the reusable option, but it is not two-way.
Do you need a pack if the flower is fresh?
Fresh, sticky flower in a sealed jar holds its own for a week or two. Add a pack after that, once the jar starts to dry.
Will a pack change the smell or taste?
Packs hold humidity, not aroma. Flower kept at a steady 58% to 62% holds more terpenes than flower left to dry out, so the smell often lasts longer.
Which pack should you buy?
Start with Boveda 62% Size 8 for a normal stash jar. Add Boveda 58% if you vape or live somewhere dry, and switch to Integra Boost if you want the indicator card. Keep a few spares on hand so you can swap a spent pack the same day it goes stiff.