I have a Griffin survivor core case (http://store.griffintechnology.com/iphone-6-4-7/survivor-core-for-iphone-6). I am looking for a leather holster that gives me access to the phone from the top while the phone is vertical. There are plenty of leather holsters but they all say that they will only fit with a slim case. This is not a big case, but it is a bit wider and taller than a regular slim case. I just wanted to see if anyone had any experience with this kind of case? Thanks.