Galaxy S6 "backpack" case?

[Blackn2020]

Samsung made a battery pack case for the Galaxy S7 that charges the phone wirelessly so that it doesn't need to plug in to the bottom of the phone, adding height. What I'm wondering is if they make this kind of case for the Galaxy S6? I've looked and I can't find one, which is weird to me because it seems like a great idea and I don't see how it's much more difficult to make than a regular battery case. Anyways, if anybody has a link to this kind of case for the Samsung Galaxy S6, it would be greatly appreciated.