An AirPod Case! You can use it for regular headphones too, for that matter, or any small items, like coins or a tin of lip balm. The chestnut & black Mayfairs come with split rings in case you want to attach it to your keys.
Features & Materials
2 5/8 x 2 3/8" 1 compartment Nickel hardware Handsewn with braided polyester thread