There is one of them:

https://www.amazon.com/Mpow-Headphones-Rechargeable-Protective-Accessories/dp/B071FQ463D/ref=sr_1_13?ie=UTF8&qid=1502890193&sr=8-13&keywords=wireless+headphone+charging+case

Here is another one:

https://www.amazon.com/mophie-Capsule-External-Battery-Wireless/dp/B01L28LWLE/ref=sr_1_3?s=electronics&ie=UTF8&qid=1502891028&sr=1-3&keywords=wireless+headphone+charging+case

https://www.amazon.com/mophie-Capsule-External-Battery-Wireless/dp/B01L28LWLE. These are much better if you want to shell out the cash only because of the build in battery. This gives you just enough space for the flipper with the silicone case attached and both usb cables.