Best Curing Jars and Humidity Packs

Drying gets moisture out of the harvest. Curing and storage hold what’s left at a steady level, so the flower doesn’t go brittle or turn moldy. Two kinds of product help with that: 2-way humidity packs, which add or absorb water vapor to hold a set relative humidity (RH) inside a sealed container, and curing containers that seal well enough for the pack, or the container itself, to do that job. This guide compares the main options from their makers’ published specs and instructions.

Start with dry flower

No jar or pack fixes flower that is still wet. Grove Bags says flower should be at 10–12% moisture content (measured with a pin meter in the stem) before it goes into a TerpLoc bag, and that it usually takes 10 to 14 days of drying to reach about 11%. Its guide describes the traditional finish line as stems that snap instead of bending. If your drying space can’t hold steady humidity, see our dehumidifier guide.

Humidity packs

	Vivi Fresh (formerly Boveda)	Integra Boost
Type	2-way (adds or absorbs water vapor)	2-way (releases or absorbs moisture)
RH levels	62% and 58%	62% (this listing)
Sizing	Size 8 for up to 1 oz (30 g)	8 g pack; also sold in 4 g in Integra’s jar kit
When to replace	Every 2–4 months, or when the pack turns hard and crunchy (Boveda)	When the dot on the included indicator card turns bright blue
Shelf life unopened	Up to 2 years	Not stated on the listing

Figures from each brand’s product pages and instructions, checked November 13, 2026.

Vivi Fresh 62%, Size 8 (formerly Boveda for Herbal)

Boveda moved its herbal packs to a new brand, Vivi Fresh, and says it is “the same product with the same performance”. CVault containers moved with it. Vivi rates one Size 8 pack for up to 1 oz (30 g) and says it keeps flower within ASTM’s recommended 55–65% RH by adding or absorbing pure water vapor. Boveda’s instructions are simple: take off the plastic overwrap, don’t open the pack itself, put it in an airtight container, and close it. Boveda also says not to mix RH levels, or to combine its packs with sponges, beads, gels or other humidifiers, because they work against each other. Boveda claims its packs can never over-humidify; that is the maker’s statement, not something we’ve seen independently measured.

Integra Boost 62%, 8 g

Integra’s packs are also 2-way and hold 62% RH in an enclosed space. The difference you can see is the replacement indicator card: when its dot turns bright blue, swap the pack. That’s useful if you’d rather not judge by feel. Integra also sells a mason-jar kit with a basket that holds the pack off the flower, three 4 g packs at 62%, and a capacity of up to 1.5 oz. It was listed as sold out when we checked.

Curing containers

CVault stainless container

CVault is made of 304 food-grade stainless steel, so it’s shatterproof and opaque. A ¼-inch food-grade silicone gasket and a latching lid keep steady downward pressure on the seal, and a patented holder under the lid keeps the humidity pack off the flower (every size except the 50 L). Sizes and rated capacities:

CVault size	Rated capacity
¼ oz (twist-off lid)	¼ oz / 7 g
½ oz (twist-off lid)	½ oz / 14 g
1 oz	1 oz / 28 g
2 oz	2 oz / 56 g
2 L	4 oz / 113 g
4 L	½ lb / 226 g
8 L	1 lb / 454 g
21 L	2 lb / 907 g
50 L	5 lb (no pack holder)

From the CVault product details, which give slightly different metric figures in two places on the same page. Each CVault includes a pack, which may be Boveda- or Vivi-branded during the changeover.

Grove Bags TerpLoc

Grove Bags takes a different approach: a multilayer pouch whose film, the maker says, passively vents excess oxygen and moisture and holds the inside at 58–62% RH. You don’t burp it and don’t add a humidity pack, as long as the flower starts at 10–12% moisture. If it’s drier than that, Grove Bags suggests adding a fresh fan leaf for moisture. Its instructions:

• Fill the bag about 75% full and leave ~25% headspace. Don’t squeeze the air out.
• Seal it. Heat-sealing is optional but better, because the zipper isn’t made of the TerpLoc film.
• Cure for two weeks to two months in a cool, dim place (around 60°F is the maker’s suggestion).

Grove Bags says the bags are reusable, and odor resistant rather than odor proof. It also cites “internal testing” showing slower THC loss than mason jars or mylar, and claims higher terpene retention. Those are the manufacturer’s own results; we found no independent study to cite, so treat them as claims.

Plain glass jars

The traditional method is a glass mason jar filled about three-quarters full, kept dark at around 65°F, and opened for a few minutes daily during the first week or two to release moisture (“burping”), then every few days. Grove Bags, which sells an alternative, describes this method as laborious and easy to get wrong. Adding a 2-way pack sized to the jar takes over most of that moisture management. Clear glass lets light in, so keep jars in a dark cupboard.

Which to choose

• You already have jars: add one Vivi Fresh Size 8 or Integra Boost 8 g pack per ounce. Choose Integra if you want the indicator card.
• You want one container that seals, blocks light and holds a pack: CVault in the size that matches your harvest.
• You’re curing larger amounts and don’t want to burp anything: Grove Bags TerpLoc. Accept that its performance claims come from the maker.
• Dry climate or high altitude: choose 62% packs, which Boveda recommends for those conditions.

How these picks were made

We compared the 2-way humidity packs and curing containers most often named for home curing on their makers’ published specifications and instructions. We did not test these products ourselves, and we found no published independent measurements comparing them. Performance claims are attributed to the brand making them. See how we research.