Boveda 4g 58% Unwrapped Bulk Humidity Control Packs, 600 Count
58% RH is the drier of Boveda's two flower levels, and the one to reach for when material is going into a long hold. Each 4 g pack covers a half ounce, moving pure water vapor across a reverse-osmosis membrane in whichever direction the jar needs. Same salt, purified water and thickening agent as the 62%, set to a lower equilibrium. A few points drier gives months on the far end, which is the whole argument for the tier. It is not a better number, just a different one. Material that moves quickly does better at 62%, where more moisture stays in. At 2" x 2" the pack lies flat under an eighth or quarter jar lid.
58% RH Packs for Drier Long Term Storage, 600 to a Case
Unwrapped bulk carries the lower per-unit cost. The trade is that every pack goes live the moment the case is opened. That makes it right for a single continuous packaging run and wrong for a case you dip into over six months. Reseal leftovers in an airtight container and they hold. Leave the case open on a bench and they will not. The individually wrapped version solves the same problem from the other direction if your fill happens in batches. Both formats exist at 58% and at 62%, so the packaging choice is independent of the setpoint. There is no indicator card in either, since a Boveda pack is read by feel as it turns granular and then hard. Plan on roughly a three-month replacement cycle.
Key Features
- 58% 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 | 58% |
| Protects | 1/2 oz (14 g) |
| Pack Dimensions | 2" x 2" |
| Case Quantity | 600 packs |
| Individual Overwrap | None — packs activate when the case is 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 | MB58-04 |
Boveda 58% or 62% — Which Should You Use?
58% runs drier and protects longer holds and denser material. 62% keeps more moisture in and suits jars moving to a customer quickly.
What Does Unwrapped Bulk Mean in Practice?
No individual overwrap, so every pack activates when the case is opened. Best used in one continuous run.
How Much Does a 4g Boveda Cover?
A half ounce, or 14 g of material. Step up to 8 g for a full ounce or 67 g for a pound.
Can Unwrapped Packs Be Stored Part-Used?
Yes, but only sealed. Move leftovers into an airtight container or bag, otherwise they discharge into the room instead of your product.