The Size 320 is the largest Boveda and is often used in storage bins to protect up to 5 pounds of cannabis. The original terpene shield, Boveda is precise humidity control for herbal medicine, which restores and maintains humidity to create a protective monolayer of water molecules over trichomes, so you can save the terps. Experience for yourself how much better cannabis is with Boveda. Boveda Size 320 is sold individually.