The first thing that comes to mind when I hear this case brought up is, "every serious single reed player needs this." It allows for percent based humidity control to keep your reed in perfect playing condition. For a more playable reed all the time, use a higher percentage Reed Vitalizer, but beware. Using a higher percentage all the time will keep your reeds moist and, if kept too moist all the time, will cause your reeds to not work. My ideal percentage is 72 or 80 depending on how humid it is outside. Keep your reeds playable for longer in the summer heat of marching band. As I say, this item is essential!