This cant be Simpler. You need one for the Humidor Pack Itself And Then one pack for every 50 cigars of CAPACITY. They say if you-have a humidor That holds 75 cigars, uses 3 packs goal I just use 2 and Its at a 69% perfeect. Just open the plastic and drop it in your humidor. When its all used up it gets hard and stiff. I recommend buying A Few (They Can stay in the plastic for 2 years) I strongly recommend Having a digital hygrometer thats beens Properly calibrated.