looking for a sheath for my Endura

[Neomentat]

I remember seeing these knife holders that holds a folder by the point, all you need to do is pull on the handle and the knife would automatically unfold. However I don't remember what this type of sheath is called and have been looking all over the internet to no avail.

Someone please point me to a site where I can order one, I prefer one with a shoulder harness. The sheath will be for my Spyderco Endura.