The Boveda 62% Humidity Control Pack is a functional and safe way for customers to keep their herb fresh and tasty. These environmentally friendly humidipak packs can even be used to help restore dried out product. The 2-way FDA approved technology will stabilize humidity within 48 hours. For best results, Boveda packs should be kept in closed, air tight containers or bags. To ensure the 2 year shelf life Boveda recommends storing in air sealed plastic bags.