Boveda Packs for Weed: Which Size & RH% to Use
Boveda packs are the easiest way to keep cannabis at a stable relative humidity without babysitting a jar or risking mold. Drop one in an airtight container and the pack absorbs or releases moisture automatically until it holds a fixed target — no propylene glycol puddles, no guesswork.
This guide covers which Boveda size and RH percentage to buy for weed, what beginners typically get wrong, and how it compares to the cigar-rated packs of the same brand.
The short answer
Use a Boveda 62% RH pack for most cannabis storage — it's the standard target that keeps flower from drying out or growing mold. Some growers and connoisseurs prefer 58% RH for a slightly drier, less "grassy" smoke and extra mold-safety margin in humid climates. Size the pack to your container: an 8-gram pack suits a small jar (up to roughly a quarter ounce), while a 60-gram pack handles an ounce or more.
The full explanation
Boveda's 2-way humidity control works the same for cannabis as it does for cigars: a salt-and-water solution inside the pack releases moisture when the air is too dry and absorbs it when the air is too wet, holding a fixed RH until the pack is spent. For cannabis specifically, Boveda sells packs calibrated to 58% and 62% RH — both are within the range growers and dispensaries consider safe for curing and long-term storage.
58% vs. 62% — which to pick:
- 62% RH is the more common choice and the default most home growers and dispensaries reach for. It keeps trichomes and terpenes intact without risking mold in normal indoor conditions.
- 58% RH trades a small amount of moisture for extra safety margin — useful in humid climates, or for anyone who's had mold trouble before. It also tends to produce a slightly less "wet" smoke.
Sizing: match the pack size to how much cannabis — and how much empty container headspace — you're storing.
| Boveda size | Amount of flower | Container size |
|---|---|---|
| 4 gram | Up to ~4 grams | Small jar or pre-roll tube |
| 8 gram | Up to ~1/4 oz (7 g) | Standard mason jar |
| 60 gram | Up to ~2 oz | Large jar or storage tote |
| 320 gram | Multiple ounces / bulk | Bulk storage tote |
Place the pack in the container with your flower, seal it, and check back in 24–48 hours — the pack does the rest automatically until it hardens and needs replacing, usually every 2 to 6 months depending on how often the container gets opened.
What beginners get wrong
The most common mistake is buying a cigar-rated Boveda pack (65%, 69%, or 72% RH) instead of a cannabis-rated one (58% or 62% RH). Cigar packs are calibrated for tobacco, which tolerates — and needs — more moisture than cannabis. Using a 69% pack on weed is a fast route to mold.
The second mistake is opening the container too often. Every time the seal breaks, humidity escapes and the pack has to work harder to recover, which shortens its life. Portion out a few days' worth into a smaller jar instead of reopening the main stash repeatedly.
The third mistake is skipping the sizing guidance and eyeballing it. An undersized pack in a large container can't keep up with the headspace and will read low; an oversized pack in a tiny container just wastes money.
Related questions
Is Boveda safe for cannabis? Yes — Boveda packs are inert, food-safe, and don't add any flavor or scent to the flower. They're widely used by licensed dispensaries for exactly this reason.
How long does a Boveda pack last for weed? Typically 2 to 6 months, depending on how often the container is opened and how much flower is stored relative to the pack size. The pack stays soft and pliable while active; once it turns hard and crunchy, it's spent and needs replacing.
Can I reuse a Boveda pack? No — once a Boveda pack hardens, it has used up its moisture-exchange capacity and won't hold RH accurately anymore. Replace it rather than trying to recharge it.
FAQ
What RH should Boveda be for weed?
Use 62% RH for standard storage, or 58% RH if you want extra insurance against mold or prefer a slightly drier smoke. Both are cannabis-specific Boveda packs, distinct from the 65–72% packs made for cigars.
What size Boveda pack for a mason jar of weed?
An 8-gram Boveda pack suits a standard mason jar holding up to about a quarter ounce of flower. For larger jars or multiple ounces, size up to a 60-gram pack.
Boveda 58 vs 62 for weed — which is better?
Neither is objectively better. 62% is the more common default and keeps flower supple, while 58% trades a touch of moisture for extra mold protection in humid climates. Try 62% first and switch to 58% only if you notice moisture problems.
Can you use a cigar humidor for weed storage?
Not a great idea. A cedar-lined cigar humidor will impart cedar flavor and aroma to cannabis over time, since cannabis absorbs surrounding scents even more readily than cigars do. A dedicated airtight glass jar with a cannabis-rated Boveda pack (58% or 62% RH) is the better choice for weed specifically — save the cedar humidor for cigars, where that wood aroma is actually part of the point. Cannabis isn't the only non-cigar use for these packs, either — see Boveda packs for guitars, trading cards & collectibles for the RH level that matters outside a humidor or a jar.
Do Boveda packs preserve terpenes, or dry them out?
They preserve them, as long as you're using the cannabis-rated 58% or 62% pack rather than a cigar-rated one. Terpenes are volatile and degrade fastest in air that's too dry, which is the main reason a stable RH matters more for flavor than any curing trick. A cigar pack's higher RH (65–72%) risks mold rather than protecting terpenes any better.
How long should you use Boveda packs during curing?
Plan on the full curing window, typically 2 to 8 weeks depending on how slow a cure you're after, swapping in a fresh pack partway through if it hardens before the cure finishes. Curing pulls more moisture out of fresh flower than long-term storage does, so a pack can spend itself faster during this stage than it would maintaining an already-cured jar.