Pebble creator made an iPhone case that can store and charge AirPods
https://www.theverge.com/circuitbreaker/2017/9/7/16266848/podcase-airpod-iphone-case-charge-kickstarter-eric-migicovsky
Apple's AirPods — like many truly wireless headphones — need to be recharged fairly often. This is typically done through the included case, which charges your headphones while you store them in it. PodCase is a new Kickstarter project from former Pebble creator Eric Migicovsky that aims to make that process a little easier by directly integrating an AirPod charger into an iPhone case.
Nova Technology — the name of Migicovsky's new venture — bills PodCase as a "slim case for carrying and charging your iPhone and AirPods," which is partly true. It certainly is a case that charges and stores your iPhone and AirPods, but the word "slim" is stretching it. The incredibly clunky-looking protrusion toward the top of the case sticks up over the top of the phone to hold the AirPods. Nothing better illustrates this point than the image on the Kickstarter page showing the case almost fitting into a pocket.