D'Addario's signature reed case holds eight of any size clarinet or saxophone reeds, from Eb clarinet through Baritone Saxophone, and features Reed Vitalizer two-way humidity control technology. Reeds are held snugly to a grooved surface, which prevents warping. The airtight gasket ensures a proper seal, which keeps reeds safe and stable when traveling. Each of our Reed Storage Cases comes with one humidity control pack in 72% relative humidity. Prevents warping and reed damage. Keeps reeds stable in various climates.