60 gram Boveda provide hassle-free maintenance of full-size humidors, Humidor Bags and air-tight food storage containers. Every Boveda RH is accurate to +/- 1% in an air tight environment. It's common that the actual RH of your humidor/container will stabilize up to 5 points lower than the Boveda RH you're using, due to container quality and ambient dryness. That's why we make Boveda in six different RH levels-62, 65, 69, 72, 75 and 84 percent. So you can use the RH that achieves the humidity you and your cigars prefer. And unlike distilled water and PG solutions with sponge/gel/crystals/beads that will impart unwanted flavors on your cigars/food. Boveda's reverse-osmosis membrane only releases pure water vapor and Boveda will never damage anything through direct contact.