Koss Headphone Carrying Case for PortaPro, SportaPro, QZ2000, KTX8, KSC17, P14, P16, and Pop Gloss (Discontinued by Manufacturer) Medium size accommodates Koss PortaPro, SportaPro, QZ2000, KTX8, KSC17, P14, P16, and Pop Gloss headphones Durable covering protects headphones Clamshell design Sturdy zipper Available in 3 additional sizes to fit a variety of Koss headphones