Maximum compatible headset dimensions (case inside): 3 x 2¼ x 1¼ inches. Compatible with many wired / wireless headphones. Quick and easy attaching to backpacks, luggage, duffel bags, camera bags, laptop bags, coolers, purses, belts, and other clippable items. Convenient to open and close by zipper, protects your Headphone and accessories away from wet, dirt and dust. Compatible with Sennheiser MOMENTUM True Wireless 3 Earbuds, Sennheiser Momentum True Wireless 2 Bluetooth Earbuds, Elite 65t, Elite Active 65t, Edifier NeoBuds Pro Hi-Res Earbuds, 330NB Hybrid Active Noise Cancelling TWS Wireless Earbuds, Hecate GM3 Earbuds Headphones case. Package includes: 1 x Earbuds Carrying case, 1 x keychain carabiner.