It is one of the most common questions home growers ask: how many humidity packs does my jar actually need? The good news is the answer is usually simpler than people expect — one correctly sized pack per sealed jar, up to an ounce of flower. The nuance is in choosing the right size, and knowing the handful of situations where you genuinely need to size up.
This guide answers how many humidity packs you need per ounce of cannabis, with no guesswork.
The short version: one 8g pack per ounce
1.5g for an eighth. 4g for a half ounce. 8g for an ounce. More than an ounce in one jar? Add another 8g pack for each extra ounce. Filling a lot of jars? The 20-pack boxes cost less per pack
Shop Humidi-Cure® 62%, from $7.99 →Count my packs with the calculator →
The short answer: one pack per jar, sized to the flower
A two-way humidity pack conditions the whole sealed environment of a jar. For an ounce of flower in an 8 to 10 oz jar, a single 8 g Humidi-Cure 62% pack does the job. You do not need to stack multiple small packs — one pack matched to the amount of flower keeps humidity even throughout the jar.
Per amount of flower
The pack should scale with how much flower you are storing. An eighth is fine with a 1.5 g pack. A half ounce wants a 4 g. A full ounce wants an 8 g. Past an ounce, add one more 8 g pack for each extra ounce in the jar, or split the flower across jars with one pack each. Between sizes? Size up — a bigger pack holds the same 62%, it just has more capacity.
When you actually need more
There are two cases. First, big headspace: if your ounce is rattling around in a half-gallon jar, the pack has a lot of air to condition, so size up. Second, frequent opening: a jar you open every day loses conditioned air each time, so the pack works harder and you replace it sooner. A small hygrometer or RH indicator card in the jar is your signal.
Why not just add packs to be safe?
Two-way packs balance toward 62% RH; they will not over-humidify, so an extra pack will not push the jar damp. But extra packs beyond what the flower needs are wasted capacity, and they do not make a too-small jar setup any more stable. Size correctly and stop there.
Scaling past a few ounces
Once you are storing more than a few ounces, buy the 20-pack boxes, which cost less per pack, and let the pack calculator turn your jars into a box count. Or move up to a ruksak 1 lb storage bag with two-way humidity built in — the simplest way to hold a larger home harvest at 62% without managing a drawer full of packs.
Frequently asked questions
How many humidity packs do I need per ounce of cannabis?
One 8 g Humidi-Cure 62% pack per ounce. For a half ounce, one 4 g pack; for an eighth, one 1.5 g pack.
Is it better to use one big pack or several small packs?
One correctly sized pack per jar is cleaner. Past an ounce in one jar, add 8 g packs to match the extra flower.
How many packs for a quarter pound of weed?
A quarter pound is four ounces, so four 8 g packs, either together in one large jar or one per jar across four ounce-size jars.
Do I need more packs in a bigger jar?
If the jar has a lot of empty headspace, size the pack up rather than leaving it undersized.
One pack, done right
Match the size, keep one per ounce, and check the jar now and then. That is all it takes to hold 62% RH.
Shop Humidi-Cure 62% packs · ruksak 1 lb bags for larger harvests.
Related reading: What Size Humidity Pack for Your Jar? · Do Humidity Packs Expire?
Not sure what your setup needs?
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