What Boveda Packs Are

Boveda packs are two-way humidity control packets that maintain a specific relative humidity level inside an enclosed space. Unlike traditional one-way humidification devices — which only add moisture — Boveda both adds and absorbs moisture as needed to hold a specific RH target.

The packet contains a saturated solution of pure water and a specific salt. Different salts produce different equilibrium humidity levels when dissolved in water — a principle called the saturated salt solution method. The permeable membrane that wraps the salt solution allows water vapor to pass in and out. When the humidity inside the humidor drops below the pack's target, the solution releases water vapor to raise it. When humidity rises above the target, the pack absorbs excess vapor. This two-way exchange is continuous and self-regulating.

Available RH Levels for Cigars

Boveda produces several humidity levels relevant to cigar storage:

  • 62% RH — The lower end of the accepted storage range. Preferred by some collectors for long-term aging and for producing a more even burn in everyday smoking.
  • 65% RH — A good balance for aging-focused storage. Slower, more controlled development with a comfortable margin below mold risk.
  • 69% RH — The most widely used Boveda level for cigar storage. Close to the traditional 70% target, suitable for everyday storage across most wrapper types.
  • 72% RH — For collectors who prefer the higher end of the standard range. Requires more careful monitoring as the margin above mold-risk conditions is narrower.
Not sure which level is right for your collection? Ideal Humidity Levels for Different Cigars breaks down the right RH target by wrapper type, blend profile, and storage goal.

Two-Way Control: Why It Matters

The two-way nature of Boveda is more significant than it might seem. Traditional one-way humidification devices — foam elements, crystal gels, propylene glycol solutions — can only add moisture. They have no mechanism for absorbing excess.

This creates a problem in humid environments or during humid seasons. If ambient humidity rises, a one-way device keeps adding moisture even as the humidor becomes over-humidified. Boveda eliminates this problem. In a humid environment, the pack absorbs excess moisture rather than competing with it. In a dry environment, it releases. The equilibrium point is fixed by the chemistry of the salt solution — you don't need to adjust, remove, or micromanage based on seasonal conditions.

Choosing the Right Size

Boveda packs are sold in different sizes — the most common for cigars are 8-gram, 60-gram, and 320-gram packs. Size refers to the amount of active salt solution, which determines how large a space the pack can manage and how long it lasts before replacement.

  • 8-gram pack: Travel cases, small desktop humidors up to 25 cigars
  • 60-gram pack: Desktop humidors, 25–100 cigar capacity
  • 320-gram pack: Large cabinet humidors, tupperdors, coolerdors

When in doubt, use more capacity rather than less. An oversized Boveda pack won't over-humidify — the chemistry prevents it from exceeding its rated RH. It will simply last longer.

When using Boveda, you don't need an additional humidification device. Adding water to a foam element or crystal gel while using Boveda will cause the pack to deplete faster. Remove other humidification sources when transitioning to Boveda.

Placement in the Humidor

For desktop humidors, place the pack above or alongside the cigars rather than underneath a dense stack where airflow is restricted. For larger humidors and cabinets, distribute multiple packs throughout the space to ensure even humidity distribution. Don't cluster all packs in one corner of a large cabinet.

When to Replace Boveda Packs

Boveda packs don't stop working suddenly — they gradually exhaust their active solution as the salt becomes fully saturated or the water fully evaporates. The indication is tactile: a fresh pack feels soft and flexible, almost like a gel pack. An exhausted pack feels stiff and cardboard-like. Check packs monthly by feel and replace before they fully exhaust.

  • Well-sealed humidor, stable environment: 2–4 months per pack
  • Less-sealed humidor or dry environment: 1–2 months per pack
  • Very dry environment (heated winter home): As little as 3–4 weeks

Boveda and Hygrometer Readings

A common point of confusion: when you use Boveda, your hygrometer may not read exactly the pack's rated RH. A 69% Boveda pack might produce a reading of 67% or 71%. This is normal. The discrepancy is almost always attributable to hygrometer calibration rather than Boveda pack inaccuracy. Boveda's salt chemistry is precise to within ±1–2% when the pack is active. If your hygrometer reads significantly outside that range, the issue is the hygrometer.

Calibrating your hygrometer before drawing conclusions about Boveda performance is essential. How to Calibrate a Hygrometer covers the salt test method step by step.

Boveda During Seasoning

A new, unseasoned humidor has very dry cedar that will absorb moisture aggressively. Placing a Boveda pack in an unseasoned humidor will cause the cedar to pull from the pack — depleting it faster than normal. Many collectors use the distilled water dish method for the initial cedar saturation, then transition to Boveda once the cedar has absorbed its first load of moisture.

The full seasoning process — including when to introduce your Boveda packs — is covered in How to Season a Humidor.