Boveda is the standard in temporary humidification. This 2-way humidification system will help you store or ship your cigars without worry that they’ll dry out. If the humidity is below what’s marked on the packet, it’ll let out more humidity. If the humidity is above the marked %, the pack will absorb humidity. It’s designed to be a set it and forget it solution for desktop humidors, travel humidors, and cigars during shipping. Lasts approximately 2-4 months in larger humidors, 6-9 months in smaller ones.