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Our patented two-way humidity controlled Boveda packs compensate the atmosphere inside your humidor. When water vapor is needed, Boveda releases the cleanest and most purified humidity. When there is too much moisture in your humidor, Boveda absorbs the excess. With Boveda, you do not have to adjust any valves or figure out if you put in too much or too little water and you will never have to fill or refill your device with water again – ever.