Retail pack 12x 70gr 49%, in counter top box 12 x 70g refill pack in a counter display box Simply insert the Boveda Pack into the humidifier and the rest will happen by itself! Boveda's unique bags have an osmotic membrane that automatically releases the internal moisture into the environment - at a constant 49% relative humidity. The special feature is that the membrane works in both directions, so that excess moisture can also be reabsorbed. There is no need for refilling at all. If the bag becomes hard and dry, it is simply replaced with a new one. Refill pack with 12 x 70g humidity control packs for 49% humidity