Boveda packs provide precise two-way humidity within +/- 1% of the labeled RH level to create the perfect storage conditions for humidity-sensitive goods. Simply seal them in your smell-proof bags or other containers with your goods and that's it. Two-way humidity control means Boveda packs add or remove moisture to deliver a precise relative humidity, resulting in the ideal moisture content for ultimate freshness. Boveda packs are completely maintenance-free, with no mess/no fuss humidity control! The 62% RH packs are Boveda's most popular pack and are ideal for maintaining aromas and flavors of many types of dried herbal goods.