Boveda 4g 62% Individually Wrapped Humidity Control Packs, 600 Count
Each 4 g pack holds a half ounce at 62% RH, adding or pulling moisture as a sealed jar drifts. Boveda's own figure is 15% higher weight retention against material stored without it, which is where the packaging economics land. At 2" x 2" it sits flat under an eighth or quarter jar lid without eating usable volume. The fill is food-grade salt, purified water and a thickening agent behind a reverse-osmosis membrane. Only pure water vapor crosses, so nothing transfers to what the pack touches. Sizing runs off weight of contents rather than jar volume, and 4 g is matched to 14 g. On a smaller load it simply lasts longer between swaps.
600 Count Bulk Humidity Packs Built for a Packaging Line
Individual wrapping is the whole point of this SKU, because every pack stays sealed and inert until the moment it is torn open at fill. That means a 600 count case can sit half-used for months without the remaining packs quietly discharging into the box. The unwrapped version costs less per unit but starts working the moment the case opens. It suits a single continuous run. Pick wrapped when fill happens in batches, unwrapped when it happens all at once. The same choice exists at 58% RH in both formats, so the setpoint does not force the packaging. What the wrapper does not give you is a spent indicator, since Boveda packs are read by feel as they turn granular and then hard. Replacement runs on roughly a three-month cycle. That holds for retail jars and for long term storage alike.
Key Features
- 62% Two-Way Control: Adds moisture to a container that has dried out and pulls it back when the lid comes off.
- Protects 1/2 oz (14 g): Sized so the pack has capacity in hand rather than running at its limit.
- Pure Water Vapor Only: A reverse-osmosis membrane means nothing but water crosses into your material.
- Food-Grade Fill: Salt, purified water and a food-grade thickener, safe resting directly against contents.
- No Activation Required: Active on arrival, so there is no soaking, charging or maintenance step.
- 2" x 2" Footprint: Seats in a lid pak holder without taking volume that would otherwise hold product.
- Tactile Replacement Signal: The pack turns granular then solid when spent, so no indicator card is needed.
- 2 Year Shelf Life: Sealed stock keeps, so holding stock ahead does not mean losing packs to age.
Technical Specifications
| Specification | Value |
|---|---|
| Pack Size | 4 g |
| Relative Humidity | 62% |
| Protects | 1/2 oz (14 g) |
| Pack Dimensions | 2" x 2" |
| Case Quantity | 600 packs |
| Individual Overwrap | Yes — each pack sealed until opened |
| Technology | Patented 2-way humidity control (adds and removes moisture) |
| Composition | Food-grade salt, purified water and a food-grade thickening agent |
| Membrane | Reverse-osmosis membrane — releases pure water vapor only |
| RH Accuracy | ±2% of labeled RH in an airtight container |
| Direct Contact | Safe against stored material; will not damage contents |
| Shelf Life | 2 years unopened |
| In-Use Life | 2–4 months; replace on a ~3 month cycle |
| End-of-Life Indicator | Pack turns granular, then solid, when spent |
| Activation | None — active on arrival, no soaking or charging |
| Equilibration Time | 24–48 hours to reach target RH in a sealed container |
| Storage When Not In Use | Keep in a sealed bag or airtight container |
| Manufacturer | Boveda Inc. |
| SKU | MB62-04-OWB |
Individually Wrapped or Unwrapped Bulk?
Wrapped packs stay dormant until opened, so a part-used case keeps working months later. Unwrapped cases start discharging as soon as they are opened.
How Much Does a 4g Boveda Pack Hold?
A half ounce, or 14 g. The 8 g size covers a full ounce and the 67 g covers a pound.
How Long Do Boveda 4g Packs Last Once In Use?
Two to four months in a sealed jar, on a roughly three-month replacement cycle. Unopened and wrapped, shelf life runs two years.
Do Boveda Packs Need Activating?
No. They arrive active, with no soaking or charging. Drop one in a sealed container and it reaches target RH within 24 to 48 hours.