Protec Viola PRO PAC Case – OblongProtecs Deluxe Viola PRO PAC Case utilizes an adjustable shoulder block secured by hook n loop fasteners to fit violas from 13 to 17. 5. Each case features a water resistant ballistic nylon exterior, large front pocket, subway handle, backside sheet music pocket, padded shoulder strap, luggage ID tag, soft molded interior, Protec microfiber cloth blanket, 2 bow clips, and a shoulder rest storage strap. Comfort Features Backpackable with optional