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Boveda Effortless Protection for Your Instruments. Starter Kit includes 2 large 70 gram Boveda packs and 2 leak-resistant fabric holders. Boveda technology is unlike all other 1-way humidifiers, it's the only true 2-way humidity control that will add or remove moisture as needed to maintain between 45-55% relative humidity in your guitar case. Protects your wooden instrument against warping, cracks and other damage caused by lack of humidification or too much humidification. Typically lasts between 2-5 months in a seasoned case. Longevity depends on time of year, case quality and ambient RH levels. Boveda pack dimensions: 5.25" x 3.5". 2+ year shelf life before opening. Bigger instruments in bigger cases require more Boveda.?