Hydrosorbent Silica Gel Desiccant Dehumidifier Box You will receive (1) Hydrosorbent Silica Gel Desiccant Dehumidifier Box Protects 66 cubic feet of enclosed space. Our largest unit is ideal protection when winterizing boats, cars and RVs. Silica gel packaged in a heavy duty corrugated carton Measures 6" x 3" x 8 1/2"