The Rico Reed Case is the only case designed to work with the Reed Vitalizer Automatic Humidity Control System. Each case holds 8 reeds for Bb clarinets on a flat surface with channels designed to allow proper air flow. Simply insert the enclosed Reed Vitalizer pack into the lid, and your reeds are guaranteed to be stored at the proper humidity level. The Rico reed case offers 2-way humidity control. Each Reed Case includes one Reed Vitalizer 73% control pack.