This product is either discontinued or we cannot get that from suppliers.
Poly Plantronics Travel Case 85298-01, Accommodates Any Blackwire Headset, For Use w/ Plantronics Models: C210, C210-M, C215, C220, C220-M, C225, C310, C310-M, C320, C320-M, C610, C610-M, C620, C620-M.
The Poly/Plantronics C310/C320/C610/C620 Travel Case is specifically designed for the blackwire series model. It will absolutely keep your blackwire headset safe and secured when you travel.