As far as I know, Glossy Translucent has to always have volume attached. It is very strange material, though. From my point of view, glossy translucent with clear volume and low roughness should be glass-like, but somehow it's surface is very scattering, no matter the volume. Well, leather is pretty scattering material, so it wouldn't bother you there.
Another thing you'd probably want to watch out for is such funny things:
To avoid it, Auto-detect Camera Volume should be disabled and Camera Volume set to "---" (none).